[Medium] Implement credential time-locking

[Josie123-Dev]

Task Description

Add credential time-locking functionality:

• Lock credentials for time periods
• Implement time-based access
• Check lock status
• Unlock credentials
• Emit lock events

Requirements

• Lock function
• Time-based logic
• Status check
• Unlock function
• Event emission

Acceptance Criteria

• Locking works
• Time-based access works
• Status is checked
• Unlocking works
• Events are emitted

[Dev-sandy1]

Good day. Please can i work on these issue.

[Arowolokehinde]

can i work on this issue? i have the neccessary expertise needed to work on this issue. i am a software developer with solid exprience in writing rust and typescript programs and working on this issue would give me more exposure to your codebase . i hope to learn more while contributing

[Arowolokehinde]

@Josie123-Dev kindly assign

[xqcxx]

I have reviewed the issue and I can submit a good pr. Please assign

[grantfox-oss]

🦊 GrantFox — @xqcxx has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #93)
2. Your PR will be reviewed by the GuardZero144 maintainers

Good luck! Track your progress on GrantFox.