Modularize SurveyConverter.toSurvey()

[anandwana001]

Fixes #2857

@gino-m @shobhitagarwal1612 PTAL?

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 62.57%. Comparing base (1ca9a52) to head (013c2d3).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...sistence/remote/firebase/schema/SurveyConverter.kt	81.25%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2939      +/-   ##
============================================
+ Coverage     62.54%   62.57%   +0.02%     
- Complexity     1203     1207       +4     
============================================
  Files           267      267              
  Lines          6362     6367       +5     
  Branches        880      879       -1     
============================================
+ Hits           3979     3984       +5     
  Misses         1833     1833              
  Partials        550      550              

Files with missing lines	Coverage Δ
...sistence/remote/firebase/schema/SurveyConverter.kt	75.00% <81.25%> (+8.33%)	⬆️