Add Exit Dialog

[hamza-vd]

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #3479

Engineer Checklist

• I have written Unit tests for any new feature(s) and edge cases for bug fixes
• I have added any strings visible on UI components to the strings.xml file
• I have updated the CHANGELOG.md file for any notable changes to the codebase
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the project's style guide
• I have built and run the FHIRCore app to verify my change fixes the issue and/or does not break the app
• I have checked that this PR does NOT introduce breaking changes that require an update to Content and/or Configs? If it does add a sample here or a link to exactly what changes need to be made to the content.

Code Reviewer Checklist

• I have verified Unit tests have been written for any new feature(s) and edge cases
• I have verified any strings visible on UI components are in the strings.xml file
• I have verifed the CHANGELOG.md file has any notable changes to the codebase
• I have verified the solution has been implemented in a configurable and generic way for reuseable components
• I have built and run the FHIRCore app to verify the change fixes the issue and/or does not break the app

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes missing coverage. Please review.

Project coverage is 27.1%. Comparing base (2f8055b) to head (53cd81e).

Files with missing lines	Patch %	Lines
...register/fhircore/quest/ui/main/AppMainActivity.kt	4.3%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              main   #3487     +/-   ##
=========================================
- Coverage     27.2%   27.1%   -0.1%     
  Complexity     749     749             
=========================================
  Files          275     275             
  Lines        13940   13963     +23     
  Branches      2532    2536      +4     
=========================================
+ Hits          3794    3795      +1     
- Misses        9622    9644     +22     
  Partials       524     524             

Flag	Coverage Δ
engine	64.3% <ø> (ø)
geowidget	12.5% <ø> (ø)
quest	5.5% <4.3%> (-0.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...register/fhircore/quest/ui/main/AppMainActivity.kt	4.8% <4.3%> (-0.2%)	⬇️

[hamza-vd]

Dialog content