[Bug] Paste behavior improvements

[Mugurell]

Following https://bugzilla.mozilla.org/show_bug.cgi?id=1664746 we should look for potential improvements.

┆Issue is synchronized with this Jira Task

[Mugurell]

I saw in Fenix we are using our own https://github.com/mozilla-mobile/fenix/blob/07748f69b75144e8e247b742f66a756f999cb299/app/src/main/java/org/mozilla/fenix/utils/ClipboardHandler.kt as a wrapper over the ClipboardManager that would allow us to easily do what we need.

But there is also the InlineAutocompleteEditText from AC which shows it's own floating menu and already responds to onTextContextMenuItem selected items.
For this I was thinking to just do the pasting ourselves similar to what now happens in https://cs.android.com/android/platform/superproject/+/master:frameworks/base/core/java/android/widget/TextView.java;drc=master;l=12891.
Seems to be the simplest and cleanest way to have full control.

Since I see you worked the most on InlineAutocompleteEditText, @csadilek does this seem like a reasonable approach?

[csadilek]

@Mugurell Yes, sounds reasonable! InlineAutocompleteEditText is a generic UI component though. It doesn't and probably shouldn't have a concept of protocols, but we can address that by providing some form of list / configuration as a parameter?

[abodea]

Verified as fixed on Nightly 1/19 with Google Pixel 4 XL (11).