Add support for HTML <datalist> tag

[PaulMaly]

Seems, html datalist tag unsupported by Svelte now. Example:
https://svelte.technology/repl?version=1.49.1&gist=43345f32fd5d811d5d156d0116179572

Cannot read property 'name' of null

TypeError: Cannot read property 'name' of null at Element.ts:58 at Array.forEach () at Element.ts:45 at Array.forEach () at Element.init (Element.ts:37) at Node.ts:87 at Array.forEach () at EachBlock.Node.initChildren (Node.ts:84) at EachBlock.init (EachBlock.ts:84) at Node.ts:87

[Conduitry]

This looks to me like another instance of #1022

[Rich-Harris]

It was indeed another manifestation of #1022 — fixed in 1.49.3