feat: add gas cap for grpc eth_call

[thomas-nguy]

Closes: #XXX

Description

add gas cap to prevent exploit

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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 45.85%. Comparing base (3b0e16c) to head (ef258e9).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #666      +/-   ##
===========================================
- Coverage    45.86%   45.85%   -0.01%     
===========================================
  Files          182      182              
  Lines        18198    18196       -2     
===========================================
- Hits          8346     8344       -2     
  Misses        9136     9136              
  Partials       716      716              

Files with missing lines	Coverage Δ
x/evm/types/tx_args.go	100.00% <100.00%> (ø)

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[songgaoye]

lgtm