Support serde in the rust implementation

[extrawurst]

Is your feature request related to a problem? Please describe.
I would really like to switch from proto to bebop but one thing it misses is supporting serialization to and from json for debugging.

Describe the solution you'd like
It would be great if bebop would add support to generate and decode to and from json aswell

[mattiekat]

I see a lot of the projects on your home page are in Rust. It would be pretty easy for me to add serde derive statements behind a feature flag which would allow using serde_json as well as the bebop serialization pathway.

[extrawurst]

I see a lot of the projects on your home page are in Rust. It would be pretty easy for me to add serde derive statements behind a feature flag which would allow using serde_json as well as the bebop serialization pathway.

a feature flag would be perfect!

[mattiekat]

We discussed this internally and at least for now we will add serde behind a flag for the Rust implementation, but we do not plan on implementing for other languages as it is non-trivial and out-of-scope.

With that said, I am going update this issue to track the serde support and not JSON support more widely. If you still want the full scope of the original ticket to be captured, please open a new ticket.

[mattiekat]

This issue is blocked by #153

I ran into a challenge almost immediately with the SliceWrapper type and since there is already an open discussion around how to better handle lists and borrowing I am going to hold off on making a band-aid solution.