[Contracts] Add Notification Revocation Mechanism

[Abd-Standard]

Description

Certain notifications may need to be revoked before recipients interact with them. Introduce a revocation mechanism that allows authorized senders to invalidate previously created notifications.

The contract should maintain a transparent record of revoked notifications.

Tasks
Add revocation state tracking.
Restrict revocation permissions.
Emit revocation events.
Prevent interaction with revoked notifications.
Create comprehensive contract tests.

Acceptance Criteria
Authorized senders can revoke notifications.
Revoked notifications become inactive.
Events are emitted correctly.
Tests cover permission checks and edge cases.

[ekwe7]

I would love to work on this issue. I have experience building production ready applications and collaborating through GitHub workflows. I'll carefully analyze the current implementation, propose a reliable solution, and submit a well-tested PR. My focus is on clean code, maintainability, and timely delivery

[ekwe7]

I would love to work on this issue. I have experience building production ready applications and collaborating through GitHub workflows. I'll carefully analyze the current implementation, propose a reliable solution, and submit a well-tested PR. My focus is on clean code, maintainability, and timely delivery

[Chigybillionz]

Hi, I’ve reviewed this issue and I’m confident I can fix it. I’d like to take it on.

[Mystery-CLI]

I have read through the required implementations and understand what to do can i work on it?

[Abdullahi-Code9]

@Abdullahi-Code9 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Abdullahi-Code9 to this issue.

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Congratulations, @Abdullahi-Code9! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[drips-wave]

This issue has been completed by @Abdullahi-Code9 as part of the Stellar Wave Program's 6th Wave 🥳

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