GitLab

* 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

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

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.

Updates IPLD Bridge to use latest go-ipld-prime and runs and actual round trip test using GraphSync,
go-ipld-prime, and real selectors

Move ResponseProgress to the types package and extract some testing functions to testutil

Make the request manager actually inject responses from the network, and perform a selector
verification

Add a channel of asynchronous errors instead of only an initial synchronous one

Create a manager for outgoing requests