Implement direct editing API

[tobiasKaminsky]

• remove old richdocument API
• only us newer direct editing API (Implement direct editing API richdocuments#721)

[tobiasKaminsky]

To clarifiy:

• when was this introduced in richdocuments app (connector to Collabora)
• can client know this
• add to code/calendar to deprecate

[alperozturk96]

To clarifiy:

• when was this introduced in richdocuments app (connector to Collabora)
• can client know this
• add to code/calendar to deprecate

Min client version: https://github.com/nextcloud/richdocuments/blob/main/lib/Listener/RegisterDirectEditorListener.php#L21
Introduced with v11.0.0: https://github.com/nextcloud/richdocuments/blob/v11.0.0/lib/DirectEditing/CreateDocument.php if I'm not wrong.