Add EVM helper functions to inspect and modify contract storage

[m-Peter]

PoC mainly for facilitating EVM testing through the Cadence testing framework.

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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 mpeter/evm-testing-storage-modification

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov-commenter]

Codecov Report

❌ Patch coverage is 16.66667% with 60 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
fvm/evm/impl/impl.go	0.00%	44 Missing ⚠️
fvm/evm/handler/handler.go	0.00%	14 Missing ⚠️
utils/unittest/execution_state.go	0.00%	2 Missing ⚠️

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