Add question bank filter API guide

[marxjohnson]

This functionality was added in MDL-72321. MDL-78220 will add several new filters, so this guide may expand as the children of that tracker are developed.

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[timhunt]

Thanks Mark. This looks like a good start to documenting this.

[timhunt]

Ah! but I see taht the automated checks need to be appeased.

[andrewnicols]

These docs look generally great. I've left a few comments -- see what you think.

Since these are docs for a 4.3 feature we should backport to 4.3 and 4.4 using the versioned_docs folders. If you need help with this I can do this on the PR -- just let me know.

Thanks

[marxjohnson]

@andrewnicols Thanks for your comments, I have made those changes and re-worked the ordering of things a bit to make it clearer which bits are compulsory, and which are more advanced. I've included those changes as fixups so I can squash them if you're happy.

I've also added an extra commit to cover the validation support I've added in MDL-83862.

[marxjohnson]

@andrewnicols Could you do that versioned_docs thing you mentioned? I've not done that before I'd be grateful of the help!

[marxjohnson]

Now this has been merged, should it be showing up on the live site or is there there a "release" that we need to wait for? I don't see it here: https://moodledev.io/docs/5.0/apis/plugintypes/qbank