feat: Added APKAM enrollment authorisation functionality into the app

[Zambrella]

- What I did

• Created a new authorisation page to display AuthorisationHub widget
• Created a repository provider for injecting AuthorisationService
• Created a PendingRequestsCountCubit for displaying pending enrollment requests
• Also updated the logic in the App Bar as to when to show the app bar actions

- How to verify it

1. Onboard an atsign with manager keys
2. Navigate to the new authorisation page and note down OTP (or generate a custom pin)
3. Send an enrollment request

E.g.

at_activate enroll \
-p app-name-demo-1 \
-d device-name-demo-1 \
-n namespace1:r,namespace2:rw \
-a @<your-atisng> \
-k test1 \
-s 123123

4. Accept/Reject request coming into the app
5. Confirm the "new" device has successfully been enrolled or rejected

- Description for the changelog
Added APKAM enrollment authorisation functionality into the app

Demo

Screen.Recording.2025-01-16.at.16.40.23.mov