[meta] drop cronet

[Bnyro]

Describe your suggested feature

F-Droid recently started marking Cronet unfree and thus LibreTube must be dropping that dependency to continue being updated on F-Droid, see #6455.

The whole downloader depends on Cronet, so that'll require a large refactor.

Other details

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[FireMasterK]

https://gitlab.com/fdroid/fdroid-suss/-/blob/master/suss/com.google.android.gms.yml

It seems to just be the media3 cronet dependency. This is likely because of this:
https://github.com/androidx/media/blob/1a7da45dd9c6419a43fab95132ed0aa0999300aa/libraries/datasource_cronet/build.gradle#L27

Maybe we can ask them if it's okay to use it without the gms dependency?

[FireMasterK]

If there's a big issue with the dependency, we could just copy the Java code from the dependency into LibreTube's code (since its apache 2), or maintain a minimal version of the library?

Edit: see https://github.com/FireMasterK/LibreTube/tree/media3-cronet

[Bnyro]

I don't think that inlining the whole Cronet source code is a good idea and I don't want to maintain a fork of an external library either, so I'll probably remove Cronet with the next release until there's a better solution.