Output platform and solc version

It would be useful to know what platform is in use for a project, and possibly solc version, in order to know how to automatically run unit tests on a project without needing a Crytic user to specify this.

I'm not sure if it would be better to make this part of the standard output of crytic-compile, or to add an option like --project-info that outputs this information as json.

The issue does not name any files, tests, or entry points. Compare the existing standard output with the proposed --project-info JSON option, determine which project platform and solc version must be exposed, and define a clear output format and tests before implementation.

Written by the indexing model from the issue text.