Extend persisted query for grouping

[klaustopher]

Ticket

https://community.openproject.org/projects/OP/work_packages/COSTS-18

What are you trying to accomplish?

• Extend the persisted query to also allow storing group_bys to add grouping to stored queries
• Change the BaseQuery to also allow multiple group_by entries, currently supports only single ones

Screenshots

What approach did you choose and why?

Merge checklist

• Added/updated tests
• Added/updated documentation in Lookbook (patterns, previews, etc)
• Tested major browsers (Chrome, Firefox, Edge, ...)

[github-actions]

Caution

The provided work package version does not match the core version

Details:

• Work package URL: https://community.openproject.org/projects/OP/work_packages/COSTS-18
• Work package version: not set
• Core version: 17.8.0

Please make sure that:

• The work package version OR your pull request target branch is correct