fix: Add and update WAI-ARIA 1.1 combobox propeties (#1068)

* Add aria 1.1 combobox properties

* Update dropdown test to account for v-show changes

* test: fix dropdown tests

* test: fix pointer scroll warnings

* refactor: implement uniqueId function

* fix: close #1072

remove empty button

Co-authored-by: Jeff Sagal <sagalbot@gmail.com>

tests/unit/utility/uniqueId.spec.js

@@ -0,0 +1,5 @@
+import uniqueId from '../../../src/utility/uniqueId';
+
+test('it generates a unique number', () => {
+  expect(uniqueId()).not.toEqual(uniqueId());
+});