Update CQL mapping structure

[paulolaup]

Model:
Mapping:
- Refactor mapping model classes into dedicated package
- Add new model classes for new structure

Dependencies

• Update HAPI FHIR to version 8.2.1 and extend scope

[paulolaup]

TODO:

• Update translation logic to use new model classes
• Update tests

[paulolaup]

Note: Updating hapi-fhir libraries to version 8.2.1 was required to get access to new parser API that allow parsing of individual FHIR data types instances. This is required for the new mapping structure, since values used to match against in the query are provided in their FHIR representation