Record which regex matched which file and where

For each datawarehouse_issueoccurrence record which of the parent datawarehouse_issue's datawarehouse_issueregex'es matched which file and at which file character offsets (and possibly line numbers).

This would help us determine which regexes match when, and optimize them. More importantly this will simplify training Kwai, or a similar solution on our regex matches, and would remove the need to reimplement all the matching logic outside of DW just to determine what matched what.

Jira: CKI-6404