Add support for CohortGenerator v1.x and additional functions for cohort attrition reporting

[anthonysena]

Summary of changes

• Incorporates work done in Support for cohort generator 1.0.0 #7 with new approach for externalizing SQL queries
• Adds new function to support backwards compatibility between CohortGenerator v0.x and v1.x. Adds "V0" and "V1" suffix to queries that have breaking changes.
• Adds new functions to support new cohort & cohort subset attrition tables in anticipation CohortGenerator v1.1 release.
• Adds unit tests and updates example data DB for testing to reflect CohortGenerator v1.1 updates.

[codecov]

Codecov Report

❌ Patch coverage is 92.59259% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.33%. Comparing base (856c0b0) to head (04265af).
⚠️ Report is 19 commits behind head on develop.

Files with missing lines	Patch %	Lines
R/CohortQueries.R	92.56%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #17      +/-   ##
===========================================
+ Coverage    92.29%   92.33%   +0.04%     
===========================================
  Files           13       13              
  Lines         5085     5258     +173     
===========================================
+ Hits          4693     4855     +162     
- Misses         392      403      +11     

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