Forward autocomplete in nimble-text-field

[kevtan-ni]

Pull Request

🤨 Rationale

nimble-text-field's real lives in shadow DOM. Browsers read that input's autocomplete attribute to autofill login fields, but nimble-text-field was not forwarding this attribute so username/password fields weren't being recognized.

👩‍💻 Implementation

• Add a public autocomplete attribute and forward it to the internal input

🧪 Testing

• Added unit tests to verifying autocomplete is forwarded to the internal input when set and absent when unset

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

@kevtan-ni sorry for the pain point but currently you need to create the branch directly in the nimble repo for all the pipeline steps to run as the chromatic UI Tests won't run for a fork (issue to support fork-pull workflows #634). I added you to the nimble team so you should be able to create a branch.
I'll close the current PR but please reach out if running into any issues making a new branch + PR directly on ni/nimble.