Feature: Implement Customizable Time Limits for Challenges

## Description
Currently, the alarm app uses fixed time limits for the various challenges. We need to implement functionality that allows users to customize these time limits. This change will enable each user to set their own preferred duration for challenges, enhancing the flexibility and user experience of the app.

## Impact
- This change enhances user customization, allowing the app to better meet individual preferences.
- The implementation will require modifications in the challenge controllers and associated views.
- Testing will be required to ensure that the updated time limits work as expected during challenge execution.

## Acceptance Criteria
- The user can specify a custom time limit from the alarm challenge configuration screen.
- The app correctly applies the custom time limit during the challenge.
- The UI clearly displays the current time limit and allows seamless adjustments.
- There are no side-effects or regressions introduced in the challenge logic.
- Appropriate tests and documentation are updated.

### Screenshots

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