chore: add flag EVMOptimisticExecution

[songgaoye]

Closes: #XXX

Description

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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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.77%. Comparing base (b88263e) to head (c6c019e).
⚠️ Report is 1 commits behind head on release/v0.22.x.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.22.x     #758      +/-   ##
===================================================
+ Coverage            46.21%   46.77%   +0.55%     
===================================================
  Files                  187      187              
  Lines                18940    15221    -3719     
===================================================
- Hits                  8754     7119    -1635     
+ Misses                9399     7315    -2084     
  Partials               787      787              

Files with missing lines	Coverage Δ
server/flags/flags.go	55.55% <ø> (+5.55%)	⬆️

... and 177 files with indirect coverage changes

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[thomas-nguy]

please update the changelog 🙏