ENH Search all summary fields and split words

[emteknetnz]

POC, don't merge

Issue #9356

1. Searches all summary_fields (or searchable_fields if available e.g. Member table)
2. Splits words on spaces

In both cases it does a WHERE .. OR on things

I think that 1) is good, I'm not entirely sure if 2) is entirely good because it won't put the most relevant search results at the top e.g. if searching on 3 words and it matches all 3, it won't necessarily put that as the top search result. Weight is the same something that partially matched on a single word. This might be considered OK though.

I'd prefer we don't attempt to go too far with this at this stage, we're not trying to build a fully fledged search engine :-) I think what we have here is a significant improvement.

Should probably point to the 4 branch because it's a behaviour change

Some front end changes are probably required within the admin module to tidy up the UX when using the advanced filter, possibly disable the 'summary_fields' field and remove the placeholder text

[emteknetnz]

SQL it writes is kind of wrong when using the new disjunctive when searching for "lorem ipsum"

 WHERE ((("Member"."FirstName" LIKE "lorem") OR ("Member"."FirstName" LIKE "ipsum))
 OR (("Member"."Surname" LIKE "lorem") OR ("Member"."Surname" LIKE "ipsum))
 OR (("Member"."Email" LIKE "lorem") OR ("Member"."Email" LIKE "ipsum)))

Other PR writes better SQL