feature: allow local runs on windows/macOS (#974)

* feature: allow local runs on windows/macOS

Cache python installations to a user cache folder using platformdirs.
The build environment is now a virtual environment to allow proper isolation.
Allows to run tests in parallel.

Co-authored-by: Joe Rickerby <joerick@mac.com>

cibuildwheel/linux.py

@@ -303,7 +303,7 @@ def build_on_docker(
     log.step_end()
 
 
-def build(options: Options) -> None:
+def build(options: Options, tmp_path: Path) -> None:
     try:
         # check docker is installed
         subprocess.run(["docker", "--version"], check=True, stdout=subprocess.DEVNULL)