Improve linting with automatic type checking

[nuwang]

Make tpv lint surround each expression with a fake, type annotated function, and perform type checking on that generated function using mypy.

@mvdbeek

say you’re doing x = job.History somewhere in an expression. Write that expression out during the lint stage as

def expression(job: galaxy.model.Job):
    x = job.History

run mypy on that and you know this will tell you what went wrong