SearchKit - Provide context information to subscribers

[colemanw]

Overview

This is a small piece broken off from #26676 which has stalled on discussion about display_name formatting, but this piece is useful elsewhere so best merge it sooner rather than later.

[civibot]

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[mlutfy]

I don't feel qualified enough to merge here, but as someone who recently started fiddling with the autocomplete hooks, this seems very useful.

Is civi.search.defaultDisplay documented, and if not, what would be the right place to document it?

[colemanw]

@mlutfy yes it is documented at https://docs.civicrm.org/dev/en/latest/framework/autocomplete/ but not with this new context param. Docs could be updated to reflect that once this is merged.