Implement direct editing API

[juliusknorr]

nextcloud/server#17625

• Make sure that template creation is properly handled with the new approach from Use FileCreatedFromTemplateEvent to inject the already existing empty templates #1377

[juliusknorr]

From previous discussions, we need to verify the implementation on Desktop, Android and iOS, while desktop has higher probability to work out of the box as the others currently have existing special logic for office documents with Collabora.

[tobiasKaminsky]

When you need help from our side, we are happy to help.
We can also have a short call between both of us to coordinate it.
Right now I am unsure what to check :)