feat(alg): Add ES512 support

[Ninos]

• Added: ES512 algorithm
• CS: strict types & phpdoc

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[Ninos]

I rebased the branch/resolved conflicts, can someone pls review? :-)

[bshaffer]

Why would we require the extension? This would block existing users from upgrading who are not currently using openssl.

[bshaffer]

am I right in understanding this is the only real code change (other than adding ES512 to the list of supported algorithms)? If so, then this is a small enough change, but I would like to see some tests! See here for examples

php-jwt/tests/JWTTest.php

Line 487 in 27179e1

public function provideEncodeDecode()

[bshaffer]

@Ninos are you still hoping to add this? If so please resolve the conflicts and respond to my questions! thank you.

[Ninos]

To be honest, I gave up after getting an empty openssl error & have no much requirements for this lib... Pushed my latest stage, if someone wants to fix, you're welcome :)

The folder ./tests/examples/ can be removed after, also the container (podman/docker) part, if not welcomed. To test, run following:
php tests/examples/jwtTest.php ES512

After that you should get following error:

PHP Fatal error:  Uncaught DomainException: OpenSSL error:  in /srv/app/src/JWT.php:327
Stack trace:
#0 /srv/app/src/JWT.php(150): Firebase\JWT\JWT::verify()
#1 /srv/app/tests/examples/jwtTest.php(37): Firebase\JWT\JWT::decode()
#2 {main}
  thrown in /srv/app/src/JWT.php on line 327

Best part of this, \openssl_error_string() returns empty string :-)

[bshaffer]

Suggested change

	default => max(1, (int) (\strlen($sig) / 2)),
	'ES256', 'ES256K', 'ES384' => max(1, (int) (\strlen($sig) / 2)),
	default => throw new InvalidArgumentException('unknown ECDNA alg: ' . $alg),

[bshaffer]

$alg parameter here is never used

Suggested change

* @param string $alg The algorithm

[bshaffer]

$alg parameter here is never used

Suggested change

	private static function signatureFromDER(string $der, int $keySize, string $alg): string
	private static function signatureFromDER(string $der, int $keySize): string