feat: implement serde for all the containers

[aminya]

No description provided.

[Manishearth]

I'm going to block this on figuring out the exact solution for #48 since that may change a bunch of the relevant internals here and I really don't want to complicate that situation more.

[aminya]

I can revert those affected by #48 until this is fixed
#48 (comment)

[Manishearth]

That's going to be most of the important ones, and plus the changes I do there may also affect other types like the BTreeMaps. I don't think it's worth landing this PR with those things removed.

[aminya]

I actually prefer if you merge #62 before this PR as it allows me to test serialization/deserialization back-to-back via assert_eq

[aminya]

Waiting for #72 so that I can add the tests for all implementations.

[Caligari]

Is this going to be merged at some point? It seems like useful functionality.

[Manishearth]

I don't really have time to work on #48 right now and I still think that's a prerequisite here.

[Manishearth]

A PR that doesn't touch the hash-based ones would be mergeable.