Partial fix for #129267.
Avoid creating an entry in the file list cache for every asset when iterating
over the available assets. For this, allow passing a pre-filter function to the
asset iterator, to filter based on `AssetRepresentation` data. The asset shelf
can then pre-filter based on asset type and the active catalog.
Really, the cached file entry is only needed to access the preview image of the
asset, so it can be avoided most of the time.
While this should still be solved properly as outlined in #122439, this is
a general improvement and fix the mentioned report in a minimal way.
Was hoping this would be sufficient to fix#129267, but the whole of
!130105 will be needed.
Pull Request: https://projects.blender.org/blender/blender/pulls/130166
0f8e4b3516