Before this commit, the types that were used for the compiler input and
output were the resolc compiler types which was a leaky abstraction as
we have traits to abstract the compilers away but we expose their
internal types out to other crates.
This commit did the following:
1. Made the compiler IO types fully generic so that all of the logic for
constructing the map of compiled contracts is all done by the
compiler implementation and not by the consuming code.
2. Changed the input types used for Solc to be the forge standard JSON
types for Solc instead of resolc.
This commit updates how logging is done in the differential testing
harness to use `tracing` instead of using the `log` crate. This allows
us to be able to better associate logs with the cases being executed
which makes it easier to debug and understand what the harness is doing.
Omar Abdulla