Validate code hash in GenesisAccount

[yihuang]

Closes: #872

Description

---

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

---

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 #873 (225430b) into main (7c53e32) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #873      +/-   ##
==========================================
+ Coverage   57.43%   57.46%   +0.02%     
==========================================
  Files          74       74              
  Lines        6153     6157       +4     
==========================================
+ Hits         3534     3538       +4     
  Misses       2408     2408              
  Partials      211      211              

Impacted Files	Coverage Δ
x/evm/genesis.go	51.66% <100.00%> (+3.45%)	⬆️

[fedekunze]

ACK, pending changelog entry

[yihuang]

ACK, pending changelog entry

done