add missing schema properties (#74)

* add missing properties

* remove incremental stream type from `conversation_parts`

* add missing custom attributes

* add missing properties

* add more properties

* add missing properties

* more properties

* hopefully final fixes

* more fixes

* fix

* set `is_sorted` to true

* try again

* remove `is_sorted`

* last schema updates

* remove duplicate definition

Author: tobiascadee