Update SearchControl to include size option

[jameskoster]

It would be nice to update the SearchControl component so that it offers size options like InputControl and SelectControl.

Currently the search input is a static 48px tall. This is inconsistent with all inputs which are gravitating towards a 40px default (see #46741).

The designs for updated tables in the site editor (#53233) call for a smaller search input (32px) tall.

Ideally the sizes would be:

• Default: 32px
• Large: 40px

We might consider a small variant too, though there's no immediate need for it.

[ciampo]

Ideally the sizes would be:

Default: 32px
Large: 40px

Shouldn't 40px be the default size, and 32px and small/compact size? That would align with the work we've been doing with all other control components.

[jameskoster]

Sure, that works :)