Windows support for contract compilation

[xermicus]

We need to compile all contracts on windows too to ensure consistent (reproducible) compiler artifacts across all supported platforms (which includes windows). However the current solution doesn't seem to be portable enough.

[bee344]

What I'm thinking about is to have the usual tests run against linux, then as a separate test to have the artifacts built with binaries compiled for platforms to make sure they are consistent. I have to understand how the CI builds the binaries first and then I'll integrate it into the suite.

[xermicus]

Yes the platform shouldn't really matter for test execution. What I'm interested in is reproducible compilation across supported platforms (linux, mac, win, Wasm).