Change how dropdown_input works to fix #672 and #679

[JoackimPennerup]

Changes dropdown_input to only use one input and keep focus on the input. This way aria-attributes are on the focused element at all times.

This also changes how dropdown_input is styled, using a style more similar to Select2, where focus is still on the control. Added a test for #672, not sure about how to write a test for #679.

[JoackimPennerup]

Changed how focus is handled to fix #660 in the same PR. iOS requires focus to be set within the same input event. Otherwise It won't open the keyboard. So I changed it to be synchronous. Firefox still wants it async, so there is a check for that too. @oyejorge any chance you could have a look at this PR?

[github-actions[bot]]

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