add gas limit buffer to cmtx

[yann-sjtu]

• 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.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #3105 (eec19d5) into dev (ef775ac) will not change coverage. The diff coverage is n/a.

:exclamation: Current head eec19d5 differs from pull request most recent head 1c5f91a. Consider uploading reports for the commit 1c5f91a to get more accurate results

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@@           Coverage Diff           @@
##              dev    #3105   +/-   ##
=======================================
  Coverage   35.90%   35.90%           
=======================================
  Files         434      434           
  Lines       45786    45786           
=======================================
  Hits        16441    16441           
  Misses      28154    28154           
  Partials     1191     1191           

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