Feature/1 input search select

[jscottsmith]

Addresses #1

<SearchSelect> allows for external options to be provided and selected through a dropdown menu, such as a text input that calls an API endpoint for autocomplete options.

Expected behaviors

• Opens when focused or clicked
• Calls an onChange after the debouncedTime has elapsed
• Calls an onSelect handler with the selected data when an option has been clicked
• Closes when focus is removed from the main or nested elements
• Closes when clicked outside of the element
• Closes when selecting an option
• Closes when an existing value is cleared from the input
• Manages focus with arrow keys when the options menu is focused up/left goes to the previous item, down/right goes to the next item and cycles from last to first/first to last

TODO

• Add example usages to readme
• Test in existing project like AM

[mnicole]

i know this is based on the DS component, but i always found it confusing, because when you "select" something it doesn't look like you have chosen the option, and you can delete the text completely and think it's not still selected.

on some apps i've done other variations, like replacing it with a tag, or putting a tag within the input. or on ad manager we clear the input whenever something is selected and someone changes the search term input in any way. what do you think?

[mahdiyejamali]

It can be good to have a default search filter, as we have for SearchMultiSelect, to filter the options in the current options list.