[in progress] Gormv2

[GeoffreyHuck]

We should upgrade to the latest version of GORM mainly for:

• Being able to use complex nested OR (eg. A OR (B AND C)). Currently we need to use subqueries, which is bad for read/write and for performance
• Being able to use addSelect(), which makes it possible to simplify the construction of complex queries
• Being able to follow the future updates

General:

• update to latest GORM and make it compile
• Rebased from 09/05/2023
• fix swagger doc

Integration tests:

• api/answers
• api/contests (5 tests to fix; looks like 2 different issues)
• api/groups/get_granted_permissions.feature (SQL syntax error)
• api/groups/get_group_progress.feature (SQL syntax error)
• api/groups/get_group_progress_csv.feature:305 (SQL syntax error)
• api/groups/get_navigation.feature (Problem with new GORM interfaces)
• api/groups/get_participant_progress.feature (Need to convert query with new With() methods)
• api/groups/get_roots.feature (Problem with new GORM interfaces)
• api/groups/get_team_progress.feature (SQL syntax error)
• api/groups/get_team_progress_csv.feature (SQL syntax error)
• api/groups/get_user_progress.feature (SQL syntax error)
• api/groups/get_user_progress_csv.feature (SQL syntax error)
• api/items (crashes during execution; should require at least the same amount of work than for api/groups; probably more)
• api/threads
• api/users

Unit tests:

• api/groups/TestService_changeCode_RetriesOnDuplicateEntryError
• database/TestDB_inTransaction_ErrorOnRollback
• database/TestDB_inTransaction_RetriesOnDeadLockError
• database/TestDB_inTransaction_RetriesOnDeadLockErrorAndPanicsOnRollbackError
• database/TestGroupGroupStore_CreateRelation (query requires update)
• logging/TestNewDBLogger_ErrorFallback (problem when testing a type)
• service/TestBase_ResolveWatchedGroupID (problem with mocking)
• service/TestApplySorting

Unknown:

• The Unknown