Protect/tag libp2p connections during data transfer

[ingar]

Problem

Connection/peer tagging was removed in a previous commit, but it is needed to prevent connections from being recycled.

Summary

Add peer tagging during data transfer in both the client and provider FSMs.

[codecov-commenter]

Codecov Report

Merging #316 into master will decrease coverage by 0.27%.
The diff coverage is 27.78%.

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
- Coverage   63.75%   63.48%   -0.26%     
==========================================
  Files          41       41              
  Lines        2590     2604      +14     
==========================================
+ Hits         1651     1653       +2     
- Misses        818      829      +11     
- Partials      121      122       +1     

Impacted Files	Coverage Δ
storagemarket/impl/client.go	3.15% <0.00%> (-0.05%)	⬇️
storagemarket/impl/provider.go	4.35% <0.00%> (-0.05%)	⬇️
storagemarket/network/deal_stream.go	63.16% <ø> (+10.99%)	⬆️
storagemarket/network/libp2p_impl.go	73.02% <0.00%> (-4.95%)	⬇️
storagemarket/impl/clientstates/client_states.go	89.44% <66.67%> (-0.56%)	⬇️
...oragemarket/impl/providerstates/provider_states.go	87.87% <100.00%> (+0.18%)	⬆️
retrievalmarket/impl/blockio/traverser.go	68.89% <0.00%> (-3.33%)	⬇️

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[ingar]

Closing in favor of filecoin-project/go-data-transfer#55