Update Autocomplete component with an onSubmit handler

[panjms]

As of currently, Autocomplete does not have an onSubmit prop and has minimal styling.

Objectives:

• add onSubmit handler
• add SearchField as a child to mirror the styling (with search icon)

Looking through other components and making a POC currently, essentially mirror most of the functionality of SearchableSingleSelect, with some reduction in code (such as locking in a selection)