Add additional CFRG curve tests

[panva]

This adds additional vectors for https://wicg.github.io/webcrypto-secure-curves/

[twiss]

The CI is complaining about duplicate test names; I think it's because of this code:

wpt/WebCryptoAPI/util/helpers.js

Lines 226 to 237 in 4758a64

	// Algorithm name specifiers are case-insensitive. Generate several
	// case variations of a given name.
	function allNameVariants(name, slowTest) {
	var upCaseName = name.toUpperCase();
	var lowCaseName = name.toLowerCase();
	var mixedCaseName = upCaseName.substring(0, 1) + lowCaseName.substring(1);
	// for slow tests effectively cut the amount of work in third by only
	// returning one variation
	if (slowTest) return [mixedCaseName];
	return [upCaseName, lowCaseName, mixedCaseName];
	}

For X25519 and X448, upCaseName and mixedCaseName are the same. Could you change that function to only return unique name variants, maybe?