Add rvdss indicator/data source

[cchuong]

Summary:

Code to create a new datasource for the epidata AP. The data is respiratory virus detections in Canada, reported by the Public Health Agency of Canada (PHAC).

Prerequisites:

• Unless it is a documentation hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

[nmdefries]

We also want to have some unit tests here. This can be complicated for functions that normally interact with external components (websites, databases, etc), but we want to at least test functions that don't require that. (External components can be faked with mocking packages, but it's not essential.)

[sonarqubecloud]

Quality Gate failed

Failed conditions
2 Security Hotspots
40.5% Duplication on New Code (required ≤ 20%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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