fix: Some fields in transaction are not authenticated by signature

[adu-web3]

Closes: #426

Description

Sorry for accidentally closing the PR #689 .
The separate test for comparing signatures in cosmos tx , MsgEthereumTx and eth tx has been added.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #703 (2fdce87) into main (fd36873) will decrease coverage by 0.02%.
The diff coverage is 56.57%.

@@            Coverage Diff             @@
##             main     #703      +/-   ##
==========================================
- Coverage   56.41%   56.39%   -0.03%     
==========================================
  Files          64       64              
  Lines        5637     5710      +73     
==========================================
+ Hits         3180     3220      +40     
- Misses       2271     2298      +27     
- Partials      186      192       +6     

Impacted Files	Coverage Δ
app/ante/eth.go	82.28% <56.00%> (-5.92%)	⬇️
app/ante/ante.go	48.19% <100.00%> (ø)

[fedekunze]

ACK, can you add a changelog entry?

[adu-web3]

ACK, can you add a changelog entry?

changelog entry is added, please review and inform me if any correction is need. @fedekunze