[Feature]: Add `<datalist>` support to `<uui-input>`

[iOvergaard]

Discussed in https://github.com/umbraco/Umbraco.UI/discussions/879

^{Originally posted by leekelleher July 30, 2024} Could we add <datalist> support to the <uui-input> component, please?

I'd noticed that it was missing whilst migrating Contentment's Text Input property-editor, but also just noticed that it could also be used in the CMS backoffice too (for pre-populating webhook's header field).