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1. Use a `taskEntryKey` *type* instead of a string (now that both peer IDs and
CIDs are hashable).
2. Get rid of all uses of `cid.KeyString` (mostly just for type safety). This
also means we don't need to parse the CID and allocate to convert it *back* from
a string.

bitswap: Bitswap now sends multiple blocks per message

fixes bs.GetSize bug

Updated PeerRequestTask to hold multiple wantlist.Entry(s). This allows Bitswap to send multiple blocks in bulk per a Peer's request. Also, added a metric for how many blocks to put in a given message. Currently: 512 * 1024 bytes. 

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

gx: update go-libp2p-routing

ci: add jenkins

add back missing gx imports

update gogo protobuf

and switch to proto3

Updates:

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

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

Otherwise, we tie up the bitswap worker until the other side responds with an EOF.

fixes #5247
related to https://github.com/libp2p/go-libp2p-net/issues/28

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>