Consider publishing on crates.io

[antoyo]

Hi.
Is there anything preventing from publishing charon on crates.io?
If not, it would be nice to have it there.
Otherwise, could at least charon_lib be published there?
Thanks.

[Nadrieril]

Hi hi, yes we'd definitely like this. I don't know of any blockers besides my own reluctance to figuring out the right GitHub actions model to have it happen automatically :')