v3.0.0: MoH data model v3 and date format

This release of Clinical ETL includes updates to enable a user to transform their tabular data into a json file compatible with the latest MoH clinical data model (v3.0).

It also adds a new required field to the manifest file that allows a user to specify a date format to ensure date values are being properly parsed.

What's Changed

• DIG-1671: Adding date format to manifest by @yavyx in #66
• add sample redcap files by @kcranston in #67
• DIG-1684: Update clinical_etl to v3 clinical data model by @yavyx in #68
• Fix up some of the validations by @mshadbolt in #69
• Update to version 3 by @mshadbolt in #70

Full Changelog: v2.2.1...v3.0.0