[Bug] ClearButtonVisibility on Entry is currently not accessible

### Description

Clearbutton is just a drawable set on the underlying TextView via this
editText.SetCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null)

So, it's not going to be reachable by a screen reader. This will mostly likely need to be solved via Custom Actions or by changing the current solution.

The native SearchView control is an EditText box with a reachable clear button so the fix here might be to switch to using a view for the clear opposed to a drawable.
i.e. here's the SearchView layout on android. Notice how the ImageView's have focusable/contentDesc's set

https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:appcompat/appcompat/src/main/res/layout/abc_search_view.xml;l=20?q=abc_search_view

Start with the Android Entry implementation and inspect how ClearButtonVisibility applies the drawable through SetCompoundDrawablesWithIntrinsicBounds. Compare it with the linked AndroidX SearchView layout, especially its focusable ImageView and content description. Done means the Entry clear button is reachable and usable by a screen reader without relying only on the drawable.

Written by the indexing model from the issue text.