Add Biometric authentication for GUI Authentication Key

[pAkalpa]

Fixes # 4236

Description of the Change

To ensure secure access and editing, implement biometric authentication for the Authentication Key field.

Alternate Designs

Release Notes

Add protection to the Authentication Key field with biometric authentication.

[AenBleidd]

Code looks fine. Some testing required (should be done next 2-3 days)

[AenBleidd]

@pAkalpa
Tested on 3 devices. All three fail with the next exception when clicking on the checkbox 'Enable Remote Control':

FATAL EXCEPTION: main
Process: edu.berkeley.boinc, PID: 27572
java.lang.ClassCastException: androidx.preference.Preference cannot be cast to androidx.preference.EditTextPreference
at t2.k0.onSharedPreferenceChanged(Unknown Source:640)
at android.app.SharedPreferencesImpl$EditorImpl.notifyListeners(SharedPreferencesImpl.java:693)
at android.app.SharedPreferencesImpl$EditorImpl.apply(SharedPreferencesImpl.java:559)
at androidx.preference.Preference.A0(Unknown Source:8)
at androidx.preference.Preference.c0(Unknown Source:32)
at androidx.preference.TwoStatePreference.E0(Unknown Source:18)
at androidx.preference.TwoStatePreference.Q(Unknown Source:19)
at androidx.preference.Preference.a0(Unknown Source:13)
at androidx.preference.Preference.b0(Unknown Source:0)
at androidx.preference.CheckBoxPreference.b0(Unknown Source:0)
at androidx.preference.Preference$a.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:7892)
at android.view.View.performClickInternal(View.java:7869)
at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
at android.view.View$PerformClick.run(View.java:30891)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8762)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

[codecov]

Codecov Report

Merging #5390 (0cc14ed) into master (44295c1) will decrease coverage by 0.02%.
Report is 21 commits behind head on master.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5390      +/-   ##
============================================
- Coverage     10.87%   10.85%   -0.02%     
  Complexity     1068     1068              
============================================
  Files           279      279              
  Lines         36061    36114      +53     
  Branches       8335     8344       +9     
============================================
  Hits           3920     3920              
- Misses        31747    31800      +53     
  Partials        394      394              

Files	Coverage Δ
...c/main/java/edu/berkeley/boinc/SettingsFragment.kt	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

[AenBleidd]

This has been tested with the next configuration:
✔️ device with biometric present and enabled
✔️ device with biometric present but disabled
✔️ device without biometric present

@pAkalpa, thank you for the implementation of this feature!