refactor(protocol): avoid memory copy in _getInstance

[dantaik]

No description provided.

[codecov]

Codecov Report

Merging #13215 (2d0f3dd) into main (9804099) will increase coverage by 0.17%.
The diff coverage is 15.38%.

@@            Coverage Diff             @@
##             main   #13215      +/-   ##
==========================================
+ Coverage   60.72%   60.89%   +0.17%     
==========================================
  Files         116      116              
  Lines        3521     3524       +3     
  Branches      483      483              
==========================================
+ Hits         2138     2146       +8     
+ Misses       1299     1293       -6     
- Partials       84       85       +1     

Flag	Coverage Δ		*Carryforward flag
bridge-ui	93.80% <ø> (ø)		Carriedforward from 9804099
protocol	51.34% <15.38%> (+0.34%)	⬆️
relayer	65.15% <ø> (ø)		Carriedforward from 9804099
ui	100.00% <ø> (ø)		Carriedforward from 9804099

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

Impacted Files	Coverage Δ
packages/protocol/contracts/L1/libs/LibProving.sol	0.00% <0.00%> (ø)
...es/protocol/contracts/test/libs/TestLibProving.sol	0.00% <0.00%> (ø)
...ackages/protocol/contracts/libs/LibBlockHeader.sol	92.30% <100.00%> (ø)
...es/protocol/contracts/thirdparty/LibMerkleTrie.sol	90.36% <0.00%> (+7.22%)	⬆️
...ges/protocol/contracts/libs/LibAnchorSignature.sol	100.00% <0.00%> (+10.52%)	⬆️

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