feat(prover): Initial powdr support #407
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This PR adds initial support to powdr proofs.
The builder works differently from r0/sp1: instead of requiring the cargo commands to compile the Rust code to ELF binaries and keep the binaries, the powdr builder calls the powdr lib to compile Rust code to powdr assembly and to powdr PIL. From that point on, the driver can load the powdr pil file to make proofs.
TODO: (missing for the first version)
getenv
@CeciliaZ030 review welcome on the general architecture and how I linked things, since some of them are different from R0/SP1.