Reimplement parallel build feature

Is your feature request related to a problem? Please describe.
For now, parallel build does not support Windows platform. Addition to this, it will be disabled soon on macOS and py38+ for security reasons (see #6803 and #6879).
So it would be nice if we'll reimplement the parallel build to support these platform.

Describe the solution you'd like
Reimplement it with "spawn" process model.

Describe alternatives you've considered
N/A