Issue #3211858 by m4olivei, gisle, guilhermevp: Add core_version_requirement to .info.yml for Drupal 9

Issue #2880250 by m4olivei, Pavan B S: Convert module to use short array syntax (new coding standard)

Add a new base table endpoint for activity series, with support for resource path and activity date range filters on the endpoint.

Add hook_requirements implementations to ensure that fitbit_views and fitbit_views_example can never be installed at the same time.

Create a simplified version of fitbit_views for the article series. This commit is the companion of part 2 in the series.

This reverts commit 82d975b3.

Issue #2833540 implement a relationship plugin to aggregate data across multiple Fitbit API endpoints.

Issue #2833518 better error handling. Log a notice in case of the only error being insufficient_scope.

Switch from dot separated array paths to colon separated b/c the config system doesn't like dots in key names.

Fix a bug with refreshing access tokens. Post refactor, need the fitbit client service in the fitbit access token manager service.