write the actual meta data into meta files with `asset_processor` feature enabled

## What problem does this solve or what need does it fill?

My initial idea was to find the equal functionality of `load_builder().with_settings(...)` in BSN. which is really a hard thing.

Then I remembered the meta file, it looks like a good alternative, and discovered the `asset_processor` feature. But it only writes a default meta files. Migrating from `with_settings` to meta files is not very smooth.

## What solution would you like?

`asset_server.load_builder().load()` can write actual meta files with `asset_processor` feature enabled.

## Additional context

Origin #24415.

Start at asset_server.load_builder().load() and trace how the asset_processor feature currently writes default meta files. Compare that behavior with the settings supplied through load_builder().with_settings(...); done means loading with asset_processor enabled writes the actual metadata needed for migration to meta files.

Written by the indexing model from the issue text.