Move a library to trash

Moves the library and all its contents into the trash. The library becomes inaccessible by default and can be fully restored within 90 days by calling restore_library. After 90 days the library's assets are gradually purged in the background; until the library row itself is removed, restore still works but recovers only the assets not yet purged.

Idempotent — a second call on an already-trashed library no-ops. To trash individual assets without trashing the whole library, use trash_assets instead.