Customize command config

[tombruijn]

• Add option to configure an additional command per package
  • Allow Node.js projects to also run npm run clean in each package.

This is just an idea:

# mono.yml
clean:
  language_command: "" # Customize the clean command for the language - This is not possible currently
  language_command:
  - "default" # Use default command as well
  - "" # Add additional commands
  package_command: "" # Customize command per package - This is possible currently with "command"
  package_command: # It's currently not possible to specify an array
  - "default" # Use default command as well
  - "" # Add additional commands per package
  pre: "" # Configure pre hook on project level (not package) - This is possible currently
  post: "" # Configure post hook on project level (not package) - This is possible currently