Trigger the default action when openfile URL param is set

[artonge]

Back:

• Add a condition when the openfile URL param is present to add an initial state object called openFileInfo.
• Change the file search provider to add the openfile URL param.

Front

• Add propagation of the openfile URL param in app.js.
• Move the handling of the openfile URL param in the initialization step of FileList so it does not wait for full rendering.
• Add API to render the Sidebar in fullscreen:
  • Add the isFullScreen property to Sidebar.vue
  • Add and expose the setFullScreenMode method: OCA.Files.Sidebar.setFullScreenMode(true/false)
  • Repatriate the --full css modifier from the Viewer.vue to Sidebar.vue
• Improve dir and id guessing in default action for folders

Fix #27100

[juliusknorr]

Tested and works with Text (viewer) and Collabora files 👍