Co-authored-by: Jonathan Almeida <jalmeida@mozilla.com>

browser-menu v2: A new browser menu designed to work with lib-state.

This introduces a new API using immutable data classes to represent
options. Stateful functionality like the two-state button is replaced
with swapping out data classes and submitting a new list of options.

Internally this uses a recycler view and the view holders intentionally
do not map 1:1 to data classes. This way we can use different views
based on properties instead of introducing all new classes for every
combination of properties.

Deprecates the `BrowserTabsTray` as well, using a `RecyclerView`
directly is now recommended.

Co-authored-by: Jonathan Almeida <jalmeida@mozilla.com>

The production method is imported from Fenix:
    https://github.com/mozilla-mobile/fenix/blob/69020a1f269c57e86fb4eb1dfd25d3ea168b5a29/app/src/main/java/org/mozilla/fenix/ext/Activity.kt#L28

And was verified to address the issue it was added for.

Co-authored-by: Christian Sadilek <christian.sadilek@gmail.com>
Co-authored-by: Simon Chae <chaesmn@gmail.com>
Co-authored-by: Mugurell <mugurell@users.noreply.github.com>
Co-authored-by: Jeff Boek <jeff@jeffboek.com>

Co-authored-by: Christian Sadilek <christian.sadilek@gmail.com>
Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>
Co-authored-by: Jonathan Almeida <jalmeida@mozilla.com>
Co-authored-by: Simon Chae <chaesmn@gmail.com>
Co-authored-by: Roger Yang <royang@mozilla.com>

to ContentBlocking.Setting.

We added the changes needed for Fenix to apply the policy settings they
need to the GeckoRuntime directly.

Since we require GeckoView changes to support the fix, we will let the
fix ride the train. However, to avoid breaking the build variants in
Fenix, we add the GeckoEngine extensions that are needed for the beta
variant. This would not give us the full benefits of the perf fixes,
but it will avoid regressing ETP changes should we upgrade the engine
and forget to apply changes we need for Fenix's GeckoProvider in beta.
Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>