Move -crypto-trait in with -consts & related cleanups #142
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When the crypto trait was introduced in #127, I tried to constrain it to the crypto/ directory. Seeing now that edhoc-consts is more and more becoming a pool of shared definitions, and keeping crates.io publication in mind, I think it's prudent to not have an extra crate, but let the crypto trait just be a module in edhoc-consts.
The refactor is marked as breaking because it removes a crate and makes a name unavailable; all affected crates are fixed by just importing the trait from somewhere else.
As bycatch now that I'm touching it, the second commit adds documentation to the trait.