Add `defaultValue` to `<select>`

Describe the problem

The difference in behavior between <input> and <select> with regards to defaultValue is confusing. I can use value and bind:value on both, but for <select> I have to add selected to the child <option> element instead of using <select defaultValue="foo">?

This also makes remote form resetting difficult to implement in sveltekit (see https://github.com/sveltejs/kit/issues/16093), because <select {...form.fields.select.as('select', 'default')}> cannot add selected to the child options.

Describe the proposed solution

Add the parity (make <select defaultValue="foo"> work).

<select value="foo"><option>foo</option></select> already compiles to <select><option selected="">foo</option></select>, so adding support shouldn't be too difficult I hope.

Importance

would make my life easier