refactor(bridge): use deterministic message status slot (w/o mapping)

[dantaik]

This PR was created as a preparation for releaseERC20 and releaseEther. Previously message status are persisted in a mapping which is not convenient to calculate Merkel proof. Now, the slot for saving a message status is calculated as:

keccak256(abi.encodePacked("message_status", signal));

[vercel]

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Name	Status	Preview	Updated
bridge-ui	🔄 Building (Inspect)		Jan 4, 2023 at 11:35AM (UTC)
website	🔄 Building (Inspect)		Jan 4, 2023 at 11:35AM (UTC)

[codecov]

Codecov Report

Merging #6861 (d5ca2a4) into main (a8e82d5) will increase coverage by 1.24%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #6861      +/-   ##
==========================================
+ Coverage   65.99%   67.24%   +1.24%     
==========================================
  Files         108      109       +1     
  Lines        2929     2940      +11     
  Branches      355      355              
==========================================
+ Hits         1933     1977      +44     
+ Misses        919      886      -33     
  Partials       77       77              

Flag	Coverage Δ		*Carryforward flag
bridge-ui	95.05% <ø> (ø)		Carriedforward from c513734
protocol	60.28% <80.00%> (+2.51%)	⬆️
relayer	69.10% <ø> (ø)		Carriedforward from c513734
ui	100.00% <ø> (ø)		Carriedforward from c513734

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

Impacted Files	Coverage Δ
...s/protocol/contracts/bridge/libs/LibBridgeData.sol	100.00% <ø> (ø)
...rotocol/contracts/bridge/libs/LibBridgeProcess.sol	17.64% <0.00%> (ø)
...protocol/contracts/bridge/libs/LibBridgeSignal.sol	69.56% <80.00%> (ø)
packages/protocol/contracts/bridge/Bridge.sol	66.66% <100.00%> (ø)
.../protocol/contracts/bridge/libs/LibBridgeRetry.sol	94.44% <100.00%> (ø)
...protocol/contracts/bridge/libs/LibBridgeStatus.sol	100.00% <100.00%> (ø)
...l/contracts/test/bridge/libs/TestLibBridgeData.sol	100.00% <100.00%> (ø)
...protocol/contracts/thirdparty/ERC20Upgradeable.sol	61.44% <0.00%> (+10.84%)	⬆️
packages/protocol/contracts/bridge/TokenVault.sol	60.86% <0.00%> (+34.78%)	⬆️

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