go/common/crypto/signature: Add batch verification goodies

[Yawning]

• Raw signatures
• Consensus transactions
• Test cases

[codecov]

Codecov Report

Merging #4602 (1e923b7) into master (f6b38e4) will decrease coverage by 0.00%.
The diff coverage is 58.69%.

@@            Coverage Diff             @@
##           master    #4602      +/-   ##
==========================================
- Coverage   66.37%   66.36%   -0.01%     
==========================================
  Files         428      429       +1     
  Lines       48512    48590      +78     
==========================================
+ Hits        32198    32249      +51     
- Misses      12361    12387      +26     
- Partials     3953     3954       +1     

Impacted Files	Coverage Δ
go/consensus/api/transaction/transaction.go	38.23% <0.00%> (-10.37%)	⬇️
go/common/crypto/signature/batch_verification.go	85.48% <85.48%> (ø)
go/common/crypto/signature/signature.go	54.26% <100.00%> (+2.60%)	⬆️
.../worker/compute/executor/committee/transactions.go	63.46% <0.00%> (-19.24%)	⬇️
go/worker/common/p2p/txsync/client.go	50.00% <0.00%> (-8.34%)	⬇️
go/worker/common/p2p/txsync/server.go	65.38% <0.00%> (-3.85%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	65.27% <0.00%> (-2.52%)	⬇️
go/common/grpc/grpc.go	79.88% <0.00%> (-2.37%)	⬇️
go/runtime/host/multi/multi.go	73.52% <0.00%> (-2.21%)	⬇️
go/runtime/registry/host.go	66.23% <0.00%> (-2.17%)	⬇️
... and 22 more

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