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* feat(graphsync): define hook interfaces, test infrastructure

rename hooks, add outgoing request hook, define chain types for node builder chooser tests

* feat(graphsync): define persistence option

add persistence options to asyncloader & responsemanager + handling

* feat(graphsync): complete persistence / node builder chooser roundtrip

* fix(lint): fix lint errors

* feat(ipldutil): add NodeBuiderChooser to traverse

Add the option to set NodeBuilderChooser on traverse, using default when nil

* feat(responsemanager): set loader and chooser in hooks

Add the ability to set a custom loader and custom node builder chooser in a response hook

* refactor(hooks): refactor default validation as hook, add unregister option

* feat(graphsync): add disable default validation option

* fix(responsemanager): fix mutex  unlocking

cover case where unlocking was not happening

* refactor(tests): introduce testify

Introduce testify, cleanup lots of tests, add channel assertions to simplify channel tests, make
more readable

* refactor(tests): clean up error messages

* fix(deps): remove bitswap

remove accidentally added bitswap

* refactor(tests): put expected in correct position

Make sure for require.equal that the expected value is the first value

* ci(circle): switch to circle

Use configs from bitswap

* fix(deps): update and standardize

* fix(lint): fix lint errors

* fix(tests): relax timings for context cancels

Since we are not relying on context cancellation as anything but a test failsafe, relax timings
significantly for slower machines

* fix(test): fix minor test error

* fix(tests): minor timing fix

* fix(lint): fix lint errors

* fix(tests): relax timings for context cancels

Since we are not relying on context cancellation as anything but a test failsafe, relax timings

Remove ipldbridge reference from README & Architecture -- was already supposed to be saved

Tech Debt: Remove IPLD Bridge

check for nil selector in a request and error if it is present

Remove all code references to a "bridge", consolodate test utils

remove remaining methods for ipld bridge

Removed mock selector spec, switch to using more real blockchain simulator

Remove the encode and decode on ipldbridge as part of ramp up to removing entirely
Also move selector encode/decode to within protobuf encoding

feat: update the peer task queue

docs(readme): document the storeutil package in the readme

The README currently implies that one needs to implement these functions
manually.

Add DAG Protobuf Support

Incorporate go-ipld-prime-proto and write test to verify that graphsync works with it

Add response hooks

DRY up integration test so it's more clear what each test is doing

Add processing of on extensions in responses in the request manager

define types and mock implementation for supporting extensions

Request hooks

refactor hook interface to pass an actions object

Breakup super long and complicated executeQuery function in two

When the request manager receives extensions in a request, it processes them and returns their
response

define types and mock implementation for supporting extensions

Add a default validation policy

add a default validation policy that only accepts selectors up to 100 depth

Send user extensions in request

add the ability to send extensions when creating requests

This reverts commit e8245a51, reversing
changes made to 2cbb73ff.

Update peertaskqueue

Refactor file organization

To reduce future import cycles, and expose more types properly, move the root package to an
interface/types file and move the main implementation into /impl. This also exposes an interface
other implementers can replace.