feat(core): add gas meter

[tac0turtle]

Description

ref #14683

this pr adds gas meter to core api, in a follow up pr we will wire it into runtime

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
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• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
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• confirmed the correct type prefix in the PR title
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• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[github-actions]

@tac0turtle your pull request is missing a changelog!

[likhita-809]

lgtm

[tac0turtle]

merging for now, @aaronc any chance you can take a look at these though