api/packages/metadata/src/Metadata

metadata update

1. New branch :)
2. curl -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "state_getMetadata", "params":[]}' http://localhost:9933
3. Copy the latest version folder (vx) in types/Metadata
4. Copy the result (hex-only) into static.ts, as of now linked to v6/static.ts
5. Rust Metadata tests, yarn run test packages/types/src/Metadata
6. Add new class types as required (find missing in Rust code, add)
7. Add all classes to src/classes.ts
8. Repeat 4-6 until passing
9. Update parsed JSON to actual output version, v6/latest.*.json
10. All tests
11. Make PR