We want to generate random but valid messages. - [x] Implement the arbitrary [by hand](https://docs.rs/arbitrary/1.0.0/arbitrary/trait.Arbitrary.html#implementing-arbitrary-by-hand) (so we don't add too many dependencies) - [x] Generate arbitrary float values - [x] Put the implementation behind a feature flag - [ ] Add a roundtrip test cf. https://github.com/technocreatives/dbc-codegen/discussions/10#discussioncomment-454260
We want to generate random but valid messages.
cf. #10 (reply in thread)