Expose if e2e keys is exists

[tobiasKaminsky]

Needed for nextcloud/android#11031
Needs: nextcloud/end_to_end_encryption#360

Signed-off-by: tobiasKaminsky tobias@kaminsky.me

[github-actions]

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	10
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	141

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	10
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	141

[github-actions]

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	10
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	141

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	10
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	141

[codecov]

Codecov Report

Merging #1000 (ac903bb) into master (240ec20) will decrease coverage by 0.02%.
The diff coverage is 25.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1000      +/-   ##
==========================================
- Coverage   48.96%   48.93%   -0.03%     
==========================================
  Files         178      178              
  Lines        6678     6686       +8     
  Branches      884      886       +2     
==========================================
+ Hits         3270     3272       +2     
- Misses       2939     2944       +5     
- Partials      469      470       +1     

Impacted Files	Coverage Δ
...sources/status/GetCapabilitiesRemoteOperation.java	48.99% <14.28%> (-0.84%)	⬇️
...cloud/android/lib/resources/status/OCCapability.kt	92.98% <100.00%> (+0.12%)	⬆️