p2p: enable p2p http txsync

[algorandskiy]

Summary

• Add multiaddr support to txsync
• Replace GossipNode.GetRoundTripper with GossipNode.GetHTTPClient as higher level alternative. (only txsync used GetRoundTripper outside of the network package.

Test Plan

Added a new unit test to txSync to test p2p flow.

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (d69938a) 56.04% compared to head (7f37f93) 56.01%.

Files	Patch %	Lines
network/p2p/http.go	0.00%	15 Missing ⚠️
network/p2pNetwork.go	52.63%	8 Missing and 1 partial ⚠️
network/hybridNetwork.go	0.00%	5 Missing ⚠️
rpcs/httpTxSync.go	61.53%	3 Missing and 2 partials ⚠️
network/wsNetwork.go	60.00%	4 Missing ⚠️
network/p2p/streams.go	0.00%	3 Missing ⚠️
network/wsPeer.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           feature/p2p    #5922      +/-   ##
===============================================
- Coverage        56.04%   56.01%   -0.03%     
===============================================
  Files              482      482              
  Lines            68078    68099      +21     
===============================================
- Hits             38153    38146       -7     
- Misses           27327    27349      +22     
- Partials          2598     2604       +6     

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[algorandskiy]

GetHTTPClient returns address of this variable, and it cannot be nil. But some client code checked it for nil