Use TaskDataHandler in DataCollectionViewModel

[shobhitagarwal1612]

Towards #2993

In #2995, we introduced TaskDataHandler for managing data state. This PR aims at using it in DataCollectionViewModel.

This shouldn't change the behavior and is no-op.

Split from #2986

@anandwana001 @scolsen PTAL?

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 63.43%. Comparing base (4dfd038) to head (108928f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...round/ui/datacollection/DataCollectionViewModel.kt	85.71%	1 Missing ⚠️
...ndroid/ground/ui/datacollection/TaskDataHandler.kt	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3005      +/-   ##
============================================
- Coverage     63.50%   63.43%   -0.08%     
+ Complexity     1251     1249       -2     
============================================
  Files           268      268              
  Lines          6521     6511      -10     
  Branches        914      912       -2     
============================================
- Hits           4141     4130      -11     
  Misses         1792     1792              
- Partials        588      589       +1     

Files with missing lines	Coverage Δ
...round/ui/datacollection/DataCollectionViewModel.kt	79.55% <85.71%> (-0.97%)	⬇️
...ndroid/ground/ui/datacollection/TaskDataHandler.kt	93.33% <66.66%> (-6.67%)	⬇️

[anandwana001]

is it a good place for object creation?

[shobhitagarwal1612]

We later need this as a dependency for TaskSequenceHandler which will also be initialized at class level.