Quiz and Question bank in Moodle 4.3

This follows on from MDL-76204. MDL-72752, MDL-70329. Continuing the work to implement the plan originally set out here: https://docs.moodle.org/dev/Question_bank_improvements_for_Moodle_4.0#Technical_overview_of_the_plans (those are links into key posts in a long quiz forum thread).

We don't know exactly what will make it into 4.3, but this is our aspiriation at the current time.

Current planned development:

• MDL-74054 Question bank column reordering, show/hide and resizing (in integration)
• MDL-72321 Implement question bank filtering (in development)
• MDL-78220 Add additional question bank filters
• MDL-77892 Make question bank columns pinnable

Hopefully more will happen, but that is still under discussion.