Move most of this to https://github.com/php/policies as per Policies RFC

Update to use GitHub security issue reporting

Update SECURITY.md

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Add a SECURITY.md community health file to the repo

Following GitHub's best practices,[^1] this adds our previously voted on
and approved[^2] security classification document[^3] to the

Add a SECURITY.md community health file to the repo

Following GitHub's best practices,[^1] this adds our previously voted on
and approved[^2] security classification document[^3] to the repository.

[^1]: https://docs.github.com/en/code-security/getting-started/adding-a-security-policy-to-your-repository
[^2]: https://wiki.php.net/rfc/security-classification
[^3]: https://wiki.php.net/security

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