Enhancement: Microsoft Office365 and Office Online support

Add support for Microsoft Office365 Cloud and Microsoft Office Online on premises. You can use the cloud feature either within a Microsoft [CSP](https://learn.microsoft.com/en-us/partner-center/enroll/csp-overview) partnership or via the ownCloud office365 proxy subscription.
Please contact sales@owncloud.com to get more information about the ownCloud office365 proxy subscription.

https://github.com/owncloud/ocis/pull/9686
