Support direct editing for notes (#1686)

* feat(capabilities): Fetch and store direct editing capability using existing capabilities code

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* feat: Implement direct editing repo

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* wip: Edit note with webview

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* wip: allow switching between the three note opening modes in preferences

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* EditNoteActivity: if no setting, use plain edit, not direct edit

Required by UX team

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* feat: Add FAB to switch to rich editing mode from plain edit/preview

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* feat: add fab while direct editing to switch to normal editing

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Fix toolbar when switching between direct edit and normal edit

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* wip: error and conflict handling when switching edit modes

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Only show direct editing FAB if direct editing is available

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* EditNoteActivity: if pref is direct edit but it's not available, launch normal edit instead

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Show error if direct editing not loaded after 10 seconds

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Update user agent for Notes webview

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Support opening new notes with direct editing

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Allow invalid ssl certs for debug builds in webview

Development only!

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* NoteDirectEdit: prevent duplicate note creation when creating it with direct edit

remote id needs to be set

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Fix create with plain edit -> direct edit flow

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

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Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>