go/registry/api: Add GetNodeByConsensusAddress method

[ptrus]

Fixes: #2961

[codecov]

Codecov Report

Merging #3067 into master will decrease coverage by 0.07%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master    #3067      +/-   ##
==========================================
- Coverage   68.24%   68.17%   -0.08%     
==========================================
  Files         371      371              
  Lines       36466    36479      +13     
==========================================
- Hits        24887    24869      -18     
- Misses       8373     8404      +31     
  Partials     3206     3206              

Impacted Files	Coverage Δ
go/registry/api/api.go	41.65% <ø> (ø)
go/registry/api/grpc.go	33.33% <0.00%> (-1.84%)	⬇️
go/worker/common/p2p/peermgmt.go	76.11% <0.00%> (ø)
go/consensus/tendermint/registry/registry.go	69.26% <60.00%> (+0.36%)	⬆️
go/consensus/tendermint/apps/registry/query.go	81.81% <100.00%> (+0.86%)	⬆️
go/registry/tests/tester.go	91.75% <100.00%> (+0.07%)	⬆️
go/worker/compute/executor/committee/state.go	74.07% <0.00%> (-11.12%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	44.11% <0.00%> (-5.89%)	⬇️
go/common/grpc/proxy/proxy.go	67.82% <0.00%> (-5.22%)	⬇️
go/worker/compute/executor/committee/node.go	61.35% <0.00%> (-4.88%)	⬇️
... and 28 more

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[kostko]

Suggested change

	// GetNodeByConsensusAddress returns the Node by Consensus address at the
	// specified block height.
	// GetNodeByConsensusAddress looks up a node by its consensus address at the
	// specified block height. The nature and format of the consensus address depends
	// on the specific consensus backend implementation used.