* introduce Asset as composition of AssetResponseDTO and AssetEntity
* filter out duplicate assets (that are both local and remote, take only remote for now)
* only allow remote images to be added to albums
* introduce ImmichImage to render Asset using local or remote data
* optimized deletion of local assets
* local video file playback
* allow multiple methods to wait on background service finished
* skip local assets when adding to album from home screen
* fix and optimize delete
* show gray box placeholder for local assets
* add comments
* fix bug: duplicate assets in state after onNewAssetUploaded
