feat(core, prompts): add async autocomplete options

[mateussilva92]

This PR enhances the autocomplete prompt to support async option functions.

What’s New:

Autocomplete:

• Autocomplete options can now be provided as an async function;
• Request cancellation via AbortController;
• Stale responses are safely ignored to prevent race conditions;
• Proper loading state handling;

Common/Helper:

• unicodeOr is now generic
• isAsync function was added.

Backwards Compatibility:

• Existing sync configurations continue to work unchanged.
• No existing unit tests changed.

Notes:

This PR has the feature itself fully developed. I didn't create any unit tests yet since I want to get feedback on my implementation. When I get an thumbs up on the implementation I'll add the unit tests / examples and remaining files.

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Latest commit: 11b7529

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