Add derives for Clone, Debug, Eq, Hash, and PartialEq for public types

[giarc3]

This makes sure that Clone, Debug, Eq, Hash, and PartialEq are on all of our public types.

Exceptions:

• IronOxide/BlockingIronOxide only have Debug, as parts of them like recrypt stop them from having others.
• build.rs-generated structs like ironoxide::proto::transform::PublicKey only have Clone and PartialEq. I looked into finding a way to make it add others with no success. The full list is EncryptedDekData, EncryptedDeks, PublicKey, UserOrGroup, and the enum UserOrGroup_oneof_userOrGroupId.

TODO:

• Depend on released recrypt-rs
• Changelog

[clintfred]

I did open rust-itertools/itertools#417 to add Hash to EitherOrBoth. It won't matter for this PR, probably, but it would let us delete a couple Hash implementations.

[clintfred]

That PR was merged.
So we could add the following to our Cargo.toml and remove the Hash impls created due to EitherOrBoth, or write a ticket and wait for the next release. I scanned through the commits to master and I don't see anything that concerns me, so I would do it, but others may disagree. Their release schedule is certainly sporadic.

# itertools 0.8.2++ - remove on next release
itertools = {git = "https://github.com/rust-itertools/itertools", rev = "c83cc48ffe39b96b7c6797b7b31752e840b373bb"}