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* Add WireTap interface

WireTap interface can be used to access all messages send and received
by Bitswap. This can be used to implement advanced statistics/analysis
logic, which is beyond scope of Bitswap, but can be implemented as IPFS
plugin.

Some examples of potential applications:
 - per CID bandwidth tracker (see: https://gitcoin.co/issue/PinataCloud/apollo/2/100023631)
 - detailed per peer stats
 - intrusion detection system (IDS) implementation

* Add test for WireTap

* Separate decision engine ledger on two parts: score and the wantlist

This is the first step to make external decision logic (tagging
peers with score values) possible.

The wantlist still resides in the original `ledger` struct while
sent/received byte accounting and scores are extracted to the new
`scoreledger` struct managed by the original `scoreWorker()` logic.
The accounting is integrated into the `Engine` via `ScoreLedger`
interface making it possible to replace the original `scoreWorker()`
with some other logic. The interface, however, doesn't allow a
score logic to directly touch peer tags: the logic may decide about
score values while tagging itself is still under control of Engine.

Note: with this commit it's yet not possible to replace the original
score logic because there is no public methods for that.

* Added "WithScoreLedger" Bitswap option

New `WithScoreLedger(decision.ScoreLedger)` option in the `bitswap`
package is the way to connect a custom `ScoreLedger` implementation
to the decision engine. The `Engine` now has the corresponding
`UseScoreLedger(ScoreLedger)` method.

The `ScoreLedger` and `ScorePeerFunc` types are exposed from the
internal `decision` package to the public one.

Because its options are processed by the `Bitswap` after construction
of its parts but before starting of the engine, the default
`scoreLedger` initialization is moved from `newEngine()` to
`StartWorkers()`.

New `TestWithScoreLedger` test is added. The test checks for start and
stop of the testing score ledger implementation that is specified via
`WithScoreLedger` option.

* Combine score ledger start with initialization of the score function

Having a separate `Init(ScoreFunc)` method seems redundant (thx
@dirkmc for pointing about that). As a bonus, the two-step ledger
starting process is now enclosed in the `startScoreLedger()` function.

* Let's call Stop() to stop a ScoreLedger

The `Close()` method was there to stop the ledger. Let call it
`Stop()` now.

* Get return of the blank Receipt out of conditional block

Explicitly form it as the final resort.
Co-authored-by: Paul Wolneykien <manowar@altlinux.org>

We use these outside of bitswap for testing.

This makes reading the docs much easier as it's clear what's "private" and
what's not.

fixes #238

This commit extends the bitswap protocol with two additional wantlist properties:

* WANT_HAVE/HAVE: Instead of asking for a block, a node can specify that they
  want to know if any peers "have" the block.
* WANT_HAVE_NOT/HAVE_NOT: Instead of waiting for a timeout, a node can explicitly
  request to be told immediately if their peers don't currently have the given
  block.

Additionally, nodes now tell their peers how much data they have queued to send
them when sending messages. This allows peers to better distribute requests,
keeping all peers busy but not overloaded.

Changes in this PR are described in: https://github.com/ipfs/go-bitswap/issues/186

feat: process response message blocks as a batch

Re-setup provider search delay and rebroadcast delay on a per bitswap instance basis

Instance generator was previously named session generator, which created confusion with bitswap
sessions

fix #101

Add comments to all exported functions, extract the utils for creating instances in testnet.go,
moves integration tests to bitswap_test

BREAKING CHANGE: removed one constant -- rebroadcastDelay -- which I believe was unused

And remove all locks.

Make Bitswap GetBlocks just create a temporary session and use that code

fix #52 fix #49

Seperates the functions of tracking wants from tracking peers
Unit tests for both peer manager and want manager
Refactor internals of both to address synchonization issues discovered
in tests

If Bitswap receives a block that isn't in it's wantlist, is should ignore it

fix #21 fix #22

Updates:

* go-net
* go-text
* dns
* prometheus
* protobuf (golang, not gogo)

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

alternative to #5243 that updates go-cid and all packages that depend on it

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

Updates:

* go-kad-dht: Query performance improvements, DHT client fixes, validates
  records on *local* put.
* go-libp2p-swarm/go-libp2p-transport: Timeout improvements.
* go-multiaddr-net: Exposes useful Conn methods (CloseWrite, CloseRead, etc.)
* go-log: fixes possible panic when enabling/disabling events.
* go-multiaddr: fixes possible panic when stringifying malformed multiaddrs,
  adds support for consuming /p2p/ multiaddrs.

fixes #5113
unblocks #4895

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

fixes #5115

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

* go-log
* sys
* go-crypto

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

This uses a working libp2p-kad-dht and libp2p-record libraries,
reverts the changes that were introduced to support the newer versions

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

This extracts the blocks/blockstore package and renames the
blocks/blockstore/util package to /blocks/blockstoreutil
(because util depends on Pin and I don't plan to extract
Pin and its depedencies).

The history of blocks/blockstore has been preserved. It has
been gx'ed and imported. Imports have been rewritten accordingly
and re-ordered.

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

This extracts the routing package to its own repository
(https://github.com/ipfs/go-ipfs-routing). History has
been preserved. The new module has been gx'ed and published.

Imports have been rewritten and re-ordered accordingly.

An internal dependency to go-ipfs/repo has been removed
by substituting it with the go-datastore.Batching interface.

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>