#83 Add optional per-query filter to WithIncludeQueryParameters

[nikolayk812]

WithIncludeQueryParameters currently records all query parameters or none. This adds an optional filter function so you can skip recording parameters for specific queries (e.g. those touching sensitive tables like users or
payments).

Since pgx uses positional parameters ($1, $2, …) with no named arg support, per-argument redaction isn't practical — per-query is the right granularity.

Usage:

  otelpgx.WithIncludeQueryParameters(func(sql string) bool {
      return !strings.Contains(sql, "payments")
  })

Fully backwards compatible — existing WithIncludeQueryParameters() calls with no filter are unchanged.