Port Reporter to ESM

[aljones15]

• [x] Require node >= 14
• [x] Convert all imports and exports to ESM (there was difficultly with this previously)
• [x] Creates branches of these test suites pointing to this issue:
• [x] https://github.com/w3c-ccg/did-key-test-suite
• [ ] https://github.com/w3c-ccg/vdl-test-suite (currently broken)
• [x] https://github.com/w3c-ccg/vc-api-issuer-test-suite
• [x] https://github.com/w3c-ccg/vc-api-verifier-test-suite
• [x] https://github.com/w3c-ccg/di-ed25519-test-suite
• [x] Remove use strict from libs

[aljones15]

this task is now done and we are ESM