Macro for importing contract bindings

[nlordell]

This issue captures the work to add an additional macro for importing contract bindings to generate tests verifying deployment information is included in the artifact.

Originally posted by @bh2smith in #630 (comment):

Maybe we could somehow generate these lines from a constant list

include!(concat!(env!("OUT_DIR"), "/WETH9.rs"));

and include in this test and assertion each element from the list was verified here...