Add "filesRoot" path to Android provider paths xml

[lewiji]

Adds a filesRoot provider path to the Android build godot_provider_paths.xml file.

See: https://github.com/godotengine/godot/pull/72495#issuecomment-1455241402

This allows custom Android plugins to register the project as a androidx.core.content.FileProvider for sharing capabilities in a compatible way with the changes in #72495.

@Derektamente has tested it with their Godroid plugin and verified that it works.

[akien-mga]

The indentation changes seem a bit arbitrary, are they intentional?

For the record, your commit seems not to be linked to your GitHub account. See: Why are my commits linked to the wrong user? for more info.

[lewiji]

Thanks for the heads up, my IDE must have done something strange there - I've fixed the indentation and the author email.

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.0.2.