Consider providing a template for record feedback

[andrewpollock]

We're seeking to shorten the feedback loop by directly connecting OSV.dev downstream consumers of Python Advisory Database vulnerabilities with the Python Advisory Database for any corrective feedback on individual records.

We can direct link users to https://github.com/psf/advisory-database/issues/new, but a blank issue page with no explicit call to action is going to be a less successful user journey than something like what we have with https://github.com/google/osv.dev/issues/new?template=converted-nvd-cve-data-quality-report.md

See google/osv.dev#2191 for more context.