### Pull Request Description
*Features Added:*
1. *App Lock Options:*
- *Device Lock*: Users can set the app lock to utilize the device's
default lock mechanism (e.g., fingerprint, face recognition, or device
PIN/password).
- *Custom PIN/Password*: Users have the option to set a custom PIN or
password for app lock.
2. *Authentication for App Lock Settings:*
- When users attempt to change the app lock settings, they must
authenticate using the currently set PIN/password or, if none is set,
the device lock.
3. *App Lock on Background and Quit:*
- The app will prompt for authentication when it is brought back to the
foreground after being in the background or when the app is restarted.
4. *Incremental Lock Timer:*
- A timer mechanism is implemented which starts at 30 seconds after few
incorrect unlock attempts.
- The lockout time doubles after each incorrect attempt, increasing
delay penalties.
- After 10 incorrect attempts, the user is automatically logged out.
