Convert suites over to local issuers / vc-gen

[aljones15]

Currently the JCS suite still creates test data by calling on a remote endpoint:

vc-di-eddsa-test-suite/tests/50-jcs-verify.js

Lines 10 to 31 in 720e2b0

	import {issuerNameJCS} from './test-config.js';
	const {tags} = config.suites['eddsa-jcs-2022'];
	// only use implementations with `eddsa-jcs-2022` verifiers.
	const {match: verifierMatches} = endpoints.filterByTag({
	tags: [...tags],
	property: 'verifiers'
	});
	describe('eddsa-jcs-2022 (verify)', function() {
	let issuedVc;
	let credentials;
	before(async function() {
	const {match: issuerMatches} = endpoints.filterByTag({
	tags: [...tags],
	property: 'issuers'
	});
	// FIXME: Currently uses 'bovine' as default issuer to issue a verifiable
	// credential for the `eddsa-jcs-2022` verifier tests. This needs to be
	// updated in future to use either Digital Bazaar or generate the vc using
	// `vc-generator` helper.
	const [issuer] = issuerMatches.get(issuerNameJCS).endpoints;

This suite needs to remove all test data creation using endpoints (even outside of the JCS verify suite).

1. expand the vc-generator to cover all suites involved with the test
2. use that vc-gen to create both rdfc and jcs test fixtures