Ssb-arbmark-fagfunksjoner

Changes

* Added type checking for groups (9) sebrothe
* Added tests for groups (10) sebrothe
* Fix type hints and documentation (8) arneso-ssb

* Added initial functions and groups (6) sebrothe

:package: Dependencies

* Bump the poetry-dependencies group with 2 updates (5) dependabot
* Bump the workflows-dependencies group in /.github/workflows with 1 update (4) dependabot
* Bump the poetry-dependencies group with 16 updates (3) dependabot
* Bump the workflows-dependencies group in /.github/workflows with 2 updates (1) dependabot
* Bump the github-action-dependencies group with 1 update (2) dependabot