ResultModelManager adoption

[anthonysena]

Aims to add the ResultModelManager package for results schema management and upload capabilities. This PR will address #154 and #162.

Additional notes:

• Added new test cohort to ensure we have the ability to test a cohort with censor stats. This is needed to test 2 things: the addition of the database_id to the cohort_censor_stats table per Results data model extensions #162 and the migration of the data model.

Outstanding items:

• Need to revise the resultsDataModelSpecification.csv to include the changes made in the migration.
• Need to add test data to test the upload
• May also add a single "runCohortGeneration" function to allow for the full set of functionality for generating cohorts in a single pass.
• Add the ability to export cohort subset definitions to ensure the upload of this new data works as expected.
• Test cases for the above.