soroban-contracts: Add reusable pausable module for emergency stop

[manoahLinks]

Implement a shared pause and unpause component for critical contract functions.

[blurbeast]

@blurbeast has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

hello my Chief, can i be allowed to work on this please ??

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[drips-wave]

Congratulations, @blurbeast! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @blurbeast: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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