npm Packages Management Feature

[phmatray]

User Story: As a developer, I want to handle npm packages and run npm scripts within my projects using MasterCommander, so that I can streamline my JavaScript development workflow.
Description: This feature adds the capability to manage npm packages and execute npm scripts directly from MasterCommander.
Design: [Placeholder for design details]
Technical Implementation: Integrate npm CLI functionalities into MasterCommander, providing a unified interface for JavaScript package management.

Acceptance Criteria:

• Users can install, update, and remove npm packages using MasterCommander.
• Users can execute npm scripts defined in package.json.
• Functionality is tested across different operating systems.