chore: add rustfmt.toml with some sensible format settings

[snawaz]

This PR primary adds rustfmt.toml and a Makefile.

Other changes are due to make fmt. That's it.

[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/rustfmt

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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: Impl V2 Commit #142
• feat: Impl V2 CommitFinalize #141
• feat: Impl V2 Delegate #140
• chore: add rustfmt.toml with some sensible format settings #139 👈 (View in Graphite)
• chore: upgrade pinocchio #138
• feat: add CommitFinalizeFromBuffer #137
• feat: add CommitFinalize #131
• feat: add AccountSizeClass and compute account-data sizes for 8 instructions #130
• main

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

[GabrielePicco]

LGTM!