Asset Browser: characters need "link with library override hierarchy"

Currently I add my armatures to my asset browser library as collection instances like so:

twitter.com/bayraitt/status/1491172683392106498

but it's a little clunky to remember to link and add overrides.

perhaps the asset browser' needs a "link with library override hierarchy" option along with "Link", "Append" and "Append ReUseData" modes.

Also, maybe each asset should get an additional "default add mode" property. Maybe set this mode automatically if someone adds a collection instance as an asset.

it would also be good if this "Linked w override" mode used the same drag position behavior as appended assets so that the dragged asset not always placed at the origin and the new position were added to the override.