Implement Parcelable for ImageDefaults

[kirillt]

Otherwise can lead to crashes.

@Serializable
data class ImageDefaults

[shubertm]

@kirillt Serializable is needed because we are storing ImageDefaults as JSON text. So to convert its objects to JSON and back efficiently we are using kotlinx-serialization.
Good reasons should be provided for implementing Parcelable, and that means new storage format because Parcelable is more better for sharing object across activities or fragments