[Data Submission] Save timestamp when capturing current location

[shobhitagarwal1612]

Towards https://github.com/google/ground-android/issues/2717

@gino-m PTAL?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 60.89%. Comparing base (7cffa80) to head (6530ec6). Report is 50 commits behind head on master.

Files with missing lines	Patch %	Lines
.../firebase/schema/CaptureLocationResultConverter.kt	0.00%	3 Missing :warning:
...n/tasks/location/CaptureLocationTaskMapFragment.kt	33.33%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2719      +/-   ##
============================================
- Coverage     60.91%   60.89%   -0.03%     
- Complexity     1164     1165       +1     
============================================
  Files           265      265              
  Lines          6046     6053       +7     
  Branches        839      839              
============================================
+ Hits           3683     3686       +3     
- Misses         1893     1897       +4     
  Partials        470      470              

Files with missing lines	Coverage Δ
...ground/model/submission/CaptureLocationTaskData.kt	55.00% <100.00%> (+5.00%)	:arrow_up:
...stence/remote/firebase/protobuf/ModelToProtoExt.kt	81.37% <100.00%> (+0.18%)	:arrow_up:
...ion/tasks/location/CaptureLocationTaskViewModel.kt	44.44% <100.00%> (ø)
...n/tasks/location/CaptureLocationTaskMapFragment.kt	58.82% <33.33%> (-7.85%)	:arrow_down:
.../firebase/schema/CaptureLocationResultConverter.kt	0.00% <0.00%> (ø)

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