Replace signature raw in the snapshots event

[vtleonardo]

This PR is changing the type of signatures being passed in the snapshot events. This should make snapshots a little bit cheaper and clear, as we will be reducing the extra 64 bytes overhead from the bytes serializing in the event data.

blocked by #157

[codecov]

Codecov Report

Merging #178 (9dd21d0) into main (b9ceed3) will increase coverage by 1.73%.
The diff coverage is 23.52%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   51.75%   53.49%   +1.73%     
==========================================
  Files         281      339      +58     
  Lines       40900    43092    +2192     
  Branches        0      358     +358     
==========================================
+ Hits        21169    23051    +1882     
- Misses      17309    17623     +314     
+ Partials     2422     2418       -4     

Impacted Files	Coverage Δ
layer1/monitor/events/snapshots.go	0.00% <0.00%> (ø)
bridge/contracts/Snapshots.sol	94.11% <100.00%> (ø)
bridge/contracts/utils/ERC20SafeTransfer.sol	100.00% <0.00%> (ø)
bridge/contracts/Distribution.sol	100.00% <0.00%> (ø)
...ntracts/libraries/parsers/BClaimsParserLibrary.sol	100.00% <0.00%> (ø)
bridge/contracts/BToken.sol	97.03% <0.00%> (ø)
bridge/contracts/utils/CustomEnumerableMaps.sol	73.17% <0.00%> (ø)
bridge/contracts/ATokenMinter.sol	100.00% <0.00%> (ø)
bridge/contracts/libraries/metadata/StakingSVG.sol	100.00% <0.00%> (ø)
bridge/contracts/utils/EthSafeTransfer.sol	100.00% <0.00%> (ø)
... and 51 more

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