Per #185, we decide to support more drivers using the plugin way.
The plugin works like protoc , developers should impls theirs generator.
ezorm.v2 will parse the YAML metadata and the call the bin , passes the metadata with JSON schema to STDIN, so ,
the user-side binary should read the metadata from STDIN and can use our pkg/plugin to decode the metadata to the the generator.
Check the e2e example for the detail usage.