refactor(combo): Use key-bindings controller (#1529)

* refactor(combo): Use key-bindings controller

This commit migrates the combo component to use
the general key-bindings controller from the library.
Aside from unifying the implementation across components
this also improves several behaviours of the combo:

* Keyboard events inside the combo are no longer "swallowed".
* Tab navigation is more natural, i.e. there are no longer 2 tab stops
per combo component.

Updated the combo test suite to accomodate for the
changes.

* fix: Post merge fixes

* feat(combo): update Escape key behavior

* refactor: Some minor code clean-ups

* fix: Arrow Up behavior in both single-select and disable-filtering states

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Co-authored-by: MonikaKirkova <[email protected]>
Co-authored-by: Bozhidara Pachilova <[email protected]>
Co-authored-by: Vasya Kacheshmarova <[email protected]>

Author: 4 people