Reload rich document edition on reload event from webview (triggered on session expiration)

[nicofrand]

This fixes the android part of #12138.
The webview part needs some tweaking but can already be used with this PR for testing: https://github.com/nicofrand/nextcloud-text/commits/fixReconnect/.

I am quite new to android development and brand new to this app (thanks @juliushaertl for all the help already). I don't know if tests should be added or how to put them. I am open to discussion ofc.

To test (see #12138):

• Use this version of the Text app that will trigger a reload event when a 403 error is caught: https://github.com/nicofrand/nextcloud-text/commits/fixReconnect/
• Open a markdown file in the android app
• Put the app in background and wait a few minutes (so the session expires due to lack of sync requests sent while in background)
• Go back to app: the app should reload

• Tests written, or not not needed

[juliushaertl]

@nicofrand Maybe you can also already open a pull request for the text part for easier testing and early review :)

[nicofrand]

@nicofrand Maybe you can also already open a pull request for the text part for easier testing and early review :)

Done: nextcloud/text#5662
There are still things to improve though on the Text app side.

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[nicofrand]

It's a bit ironic to get a survey about a pull request that did not receive any feedback…