feat: Implement thread local storage based execution stash

[bmuddha]

This stash can be used for communication between magic program and the rest of the validator, as a more performant and easier to use alternative to Context accounts.

[github-actions]

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch bmuddha/feat/tls-task-queue

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