Added Caching for View-to-Parquet writes

[itsiggs]

Description of what I changed

Quick refactoring to extend the cache implementation by @bashir2 to views for View-to-Parquet.

E2E test

TESTED:

Checklist: I completed these to help reviewers :)

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• I have added tests to cover my changes. (If you refactored existing code that was well tested you do not have to add tests)

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• All new and existing tests passed.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 51.80%. Comparing base (4747017) to head (3bd5dfc).

Files with missing lines	Patch %	Lines
...in/java/com/google/fhir/analytics/ParquetUtil.java	42.85%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1171      +/-   ##
============================================
- Coverage     51.83%   51.80%   -0.03%     
  Complexity      710      710              
============================================
  Files            95       95              
  Lines          5834     5837       +3     
  Branches        772      773       +1     
============================================
  Hits           3024     3024              
- Misses         2520     2523       +3     
  Partials        290      290              

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[bashir2]

Thanks @itsiggs for the quick fix.