feat: support query gas limit flag

[thomas-nguy]

Closes: #587

Remove hard coded cap

Description

Remove hard coded cap, use flag instead

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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

❌ Patch coverage is 44.73684% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.82%. Comparing base (2b2eb9b) to head (b053551).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
x/evm/keeper/grpc_query.go	34.37%	19 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #678      +/-   ##
===========================================
- Coverage    45.86%   45.82%   -0.04%     
===========================================
  Files          182      182              
  Lines        18194    18218      +24     
===========================================
+ Hits          8344     8348       +4     
- Misses        9134     9152      +18     
- Partials       716      718       +2     

Files with missing lines	Coverage Δ
evmd/app.go	78.08% <100.00%> (+0.03%)	⬆️
x/evm/keeper/keeper.go	83.21% <100.00%> (+0.12%)	⬆️
x/evm/types/tx_args.go	100.00% <100.00%> (ø)
x/evm/keeper/grpc_query.go	74.05% <34.37%> (-2.52%)	⬇️

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[songgaoye]

lgtm