API for calculating hash of inline script/src

Provide an API to calculate the hash of a script or style to be included inline
https://www.w3.org/TR/CSP/#grammardef-hash-source

e.g.

class Csp {
  protected static $hashAlgorithms = ['sha256', 'sha384', 'sha512'];

  public static function hashSource($data, $algo = 'sha256') {
    if (!in_array($algo, static:hashAlgorithms)) {
      throw new \InvalidArgumentException('Hash algorithm not supported');
    }
    return base64_encode(hash($algo, $data));
  }
}