feat(p2p)!: remove conngater dependency

[walldiss]

libp2p conngater is exact type and not an interface, which makes it impossible to modify or mock its functionality on client side. Replaces libp2p conngater dependency with callback func, to allow easy mocking for clients.

Required by celestiaorg/celestia-node#2702 to provided conngater with white list instead of basic one.

[codecov-commenter]

Codecov Report

Merging #107 (e8b49e3) into main (a6544e3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #107   +/-   ##
=======================================
  Coverage   68.60%   68.60%           
=======================================
  Files          37       37           
  Lines        2934     2934           
=======================================
  Hits         2013     2013           
  Misses        770      770           
  Partials      151      151           

Files Changed	Coverage Δ
p2p/exchange.go	82.17% <100.00%> (ø)
p2p/peer_tracker.go	78.75% <100.00%> (ø)

[Wondertan]

There is an interface https://github.com/libp2p/go-libp2p/blob/master/core/connmgr/gater.go

[walldiss]

It is different one, used as dialer interceptor

[walldiss]

It does not have BlockPeer()

[Wondertan]

I see, that's confusing

[renaynay]

Fine with me but please mark as breaking @walldiss

[Wondertan]

Well, actually, it would be nice to make a local interface, that has BlockPeer on it. In the future when we need more methods of PeerGater, we will then just add them, instead of breaking again.

[Wondertan]

Comment above

[walldiss]

If we create a interface and change it later, it would break api, because implementations satisfying old interface will not satisfy new one. So we can defer creation of extra abstraction until we need it.

[Wondertan]

I mean adding more methods of PeerGater interface which BasicConnGater satisfies