b6c5d71fe2
This introduces several things to optionally support automatic derive attributes for `serde::{Deserialize, Serialize}` for the generated models:
- introduces a `WithSerde` enum to indicate if Serialize, Deserialize, or even both should be derived from,
- adds an optional cli argument `--with-serde [none: default, serialize, deserialize, both]`
- adds test harness for both compact and expanded generation