Add SIMILARITY to GroupOrderBy enum

`GET /groups?order_by=similarity` is supported but not available in the
high level API
https://gitlab.com/gitlab-org/gitlab/-/issues/332889

make sure system-stubs-jupiter is marked for test scope

Fix NullPointer on invalid settings

Settings having only a single Type caused a NullPointer when
printing the allowed types.

Improves #818

Enable build on GitHub Actions

Migrate from JUnit 4 to JUnit 5

Adding getContributors sort by asc / desc support

Fix #810 : Change all model Ids to Long

Update Deployment API 

Implement keys api

Actually fetch all the memberships with UserAPI.getMemberships() and …

Fixed de-serialization of MembershipSourceType by letting the Jackson…

Fixed de-serialization of MembershipSourceType by letting the JacksonJsonEnumHelper know that the first letter should be capitalized

Actually fetch all the memberships with UserAPI.getMemberships() and also provide a pager based method for lazy fetching

Fix #767 : Adding merge request note award functions and renaming issue functions

configure jersey to use jackson over json binding

Create new projects from project template.

Include Pipeline data in Merge Request model