Add ed15519-*-2020 tests.

[davidlehn]

The test suite is using ed25519-*-2018 packages. The tests should also check using ed25519-*-2020 packages that are used in the README examples.

[aljones15]

There is a branch that is attempting to abstract all the tests into a form so that you can just drop an entry with your cryptosuite and some basic settings and then the cryptosuite will be tested by all assertions: https://github.com/digitalbazaar/vc/tree/vc-2.0-refactor-tests

vc/test/mocks/suites.js

Lines 32 to 54 in bd19ae1

	async function eddsaRdfc2022() {
	// set up the EDDSA key pair that will be signing and verifying
	const keyPair = await EddsaMultikey.generate({
	id: 'https://example.edu/issuers/keys/5',
	controller: 'https://example.edu/issuers/565049'
	});
	const keyDoc = await keyPair.export({publicKey: true});
	registerKey({keyDoc});
	return {
	keyDoc,
	keyPair,
	keyType: 'Ed25519',
	suiteName: 'eddsa-rdfc-2022',
	cryptosuite: eddsaRdfc2020Cryptosuite,
	suites: createSuites({
	keyPair,
	suiteName: 'eddsa-rdfc-2022',
	derived: false,
	cryptosuite: eddsaRdfc2020Cryptosuite
	}),
	derived: false
	};
	}