Certifier: Generate one Proof .agda file per certified pass (#7814)
In an Agda certificate, all work for type-checking the translation relation proofs is done in the top-level agda module. This PR instead constructs a module per pass which has the corresponding translation relation proof. This is useful for performance debugging when type-checking an agda certificate, as we can see a break-down of the decision procedure's performance. So in addition to Pass_xyz/AST.agda, there is now also Passxyz/Proof.agda. The top-level module simply imports the proofs and constructs the certificate proof (a big tuple).