feat: add items prop, proper height and validation lib support to select

[CryptAlchemy]

Items are passed into the Select as either an object or an array via the items prop. Breaks existing Select implementations as there is no backwards-compatibility for in the Select; an array or object must be used. This deprecates Option.svelte.

The Select scales the menu according to device height if menu$fixed={true} prop is passed.

Select respects hiddenInput prop by appropriately calling events on the field, including the SMUISelect:change event. The hiddenInput also contains a data-smui="true" prop for easy identification in standard browser-level form validation libraries.

Closes #242, #468

[hperrin]

Using an items array limits the structure of whatever you pass into it, so I wouldn't be willing to do that. If you can make it just the height changes, I might could accept that.