Previsouly when selecting item A and then removing it, it was impossible
to select it again. This was caused by the internal memory of useSelect
that only provides undefined selectedItem inside the onStateChange callback
when the item has not changed. So by forcing it everytime to null it is
now providing it everytime.
It was considered as a bad practice to include array indexes in list
elements keys even though it was made this way in the documentation. We
removed them and also decided to drop the use of options value in the
keys too to the profit of optionToValue which can never be undefined or null.
This changes caused test crashing due to the fact that it made the useSelect
onStateChange trigger a onBlur event that was causing the first option of the
list to be selected automatically, which was a really weird behavior. Before
it was not happening because newSelectedItem was not defined, using the
new keys made it defined, we don't 100% understand why yet.
This new major version broke our components, including the way the menu
gets opened, how to determine the disabled options and some other semantic
types changes.
Adding this new variant makes necessary to reorganize the files to keep
a clear separations of concerns. As of now Select/index.tsx is just an
entrypoint to render either the mono or multi variant of the select.
