feat: Add CommitDiffFromBuffer ix

[snawaz]

Implements CommitDiffFromBuffer instruction that helps minimizing transaction size to keep it within the limit.

For more context, see: magicblock-labs/magicblock-validator#616

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch snawaz/commit-diff-from-buffer

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[snawaz]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: Add CommitDiffFromBuffer ix #118 👈 (View in Graphite)
• feat: Handle account shrinking/expansion in merge_diff_copy #116
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[taco-paco]

LGTM