refactor(preg): back PregMatches with regex::Captures

PregMatches was an IndexMap of owned Strings copied out of the match, so
every preg_match2/preg_replace_callback call allocated a String per
capture group (twice over for a named group) whether or not the caller
read it. It now wraps the regex::Captures itself, held alongside the
pattern it came from so groups stay reachable by both their named and
their numbered form, and hands out &str borrowed from the subject. The
subject's lifetime becomes a parameter of the type.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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