fix: Some fields in transaction are not authenticated by signature

[adu-web3]

Closes: #426

Description

Some fields in transaction are not authenticated by signature, so there may be a cosmos transaction malleability vulnerability.
Since cosmos transaction is not signed, we can verify most of the fields of tx.Tx as null and verify fields like Fee.Amount and Fee.GasLimit based on MsgEtherumTx

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• Added relevant godoc comments.
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[codecov]

Codecov Report

Merging #689 (2f4d806) into main (08a8191) will increase coverage by 0.04%.
The diff coverage is 59.82%.

@@            Coverage Diff             @@
##             main     #689      +/-   ##
==========================================
+ Coverage   57.36%   57.41%   +0.04%     
==========================================
  Files          63       63              
  Lines        5505     5570      +65     
==========================================
+ Hits         3158     3198      +40     
- Misses       2180     2199      +19     
- Partials      167      173       +6     

Impacted Files	Coverage Δ
rpc/ethereum/types/utils.go	0.00% <ø> (ø)
server/config/config.go	21.48% <36.36%> (-0.12%)	⬇️
app/ante/eth.go	82.28% <56.00%> (-5.92%)	⬇️
app/ante/ante.go	48.19% <100.00%> (ø)
encoding/config.go	95.00% <100.00%> (ø)
x/evm/types/chain_config.go	100.00% <100.00%> (ø)

[tomtau]

maybe good to add some tests for the failure cases?

[adu-web3]

maybe good to add some tests for the failure cases?

Good idea!
I will add more tests for failure cases.

[adu-web3]

Add more tests for failure cases where the tx.Tx gets signed, or has Memo, TimeoutHeight, or has invalid fee amount and gaslimit (not compatible with MsgEthereumTx).
Fix the typo protoTxPrivider -> protoTxProvider as well.

[fedekunze]

Thanks for the PR, I'd like to see a separate test that compares the signatures from:

• MsgEthereumTx (v, r, s)
• sdk.Tx using the tx Builder
• ethereum Transaction

[adu-web3]

Thanks for the PR, I'd like to see a separate test that compares the signatures from:

• MsgEthereumTx (v, r, s)

• sdk.Tx using the tx Builder

• ethereum Transaction

Ok, I will write a separate test comparing these signatures