feat(protocol): add TaikoL1.getBlockProvers

[davidtaikocha]

Provers may need to know how many proofs have been submitted for a pending block, and check whether it exceeds TAIKO_MAX_PROOFS_PER_FORK_CHOICE, before submitting the proof.

[codecov]

Codecov Report

Merging #340 (8dfec2b) into main (81aeb1d) will increase coverage by 0.28%.
The diff coverage is 100.00%.

❗ Current head 8dfec2b differs from pull request most recent head e38cdd4. Consider uploading reports for the commit e38cdd4 to get more accurate results

@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
+ Coverage   63.00%   63.29%   +0.28%     
==========================================
  Files          83       83              
  Lines        2449     2452       +3     
  Branches      281      281              
==========================================
+ Hits         1543     1552       +9     
+ Misses        834      827       -7     
- Partials       72       73       +1     

Flag	Coverage Δ		*Carryforward flag
protocol	58.92% <100.00%> (+0.34%)	⬆️
relayer	69.02% <ø> (+0.21%)	⬆️	Carriedforward from 46eb062

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
packages/protocol/contracts/L2/V1TaikoL2.sol	56.81% <ø> (ø)
packages/protocol/contracts/L1/TaikoL1.sol	21.27% <100.00%> (+3.49%)	⬆️
...ges/protocol/contracts/libs/LibAnchorSignature.sol	89.47% <0.00%> (-10.53%)	⬇️
packages/relayer/http/routes.go	100.00% <0.00%> (ø)
packages/relayer/http/server.go	96.00% <0.00%> (+2.84%)	⬆️
...es/protocol/contracts/thirdparty/LibMerkleTrie.sol	90.36% <0.00%> (+7.22%)	⬆️

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