Optimize knowledge transfer volumes query

[mzur]

I found that this query is quite slow with our production database. I'm sure it can be optimized.

maia/src/Http/Controllers/Api/KnowledgeTransferVolumeController.php

Lines 40 to 55 in 6494b4b

	return Volume::accessibleBy($request->user())
	->select('id', 'name')
	->has('images.annotations')
	->whereNotExists(function ($query) {
	$query->select(DB::raw(1))
	->from('images')
	->whereRaw('images.volume_id = volumes.id')
	->whereNull('attrs->metadata->distance_to_ground');
	})
	->with(['projects' => function ($query) {
	$query->select('id', 'name');
	}])
	->get()
	->each(function ($volume) {
	$volume->setHidden(['doi']);
	});