Search kit: Improve token support

[colemanw]

Overview

Adds a token selector to the UI when configuring displays.

Before

No token selector

After

Technical Details

This necessitated declaring explicit aliases for all fields using sql functions. That's also going to benefit an upcoming round of work to support more functions.

[civibot]

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[eileenmcnaughton]

Go ahead & merge this as it is entirely within the extension - however, it possibly could tie in with my interest in using search kit searches as the basis of scheduled reminder groups (using the api params or saved_search_id)