Add CommonJS support for js-sdk and fix TypeScript definitions for better IDE support in platforms like Nest.js

[centrual]

What

This PR focuses on improving the JavaScript SDK by adding CommonJS support and fixing TypeScript type issues. Changes include:

• CommonJS support: Added support for CommonJS modules to enhance compatibility with platforms like Nest.js.
• TypeScript types dependency: Added necessary TypeScript type packages as dependencies to ensure the SDK can compile properly with TypeScript support.
• Header normalization fix: Corrected an issue where headers were incorrectly formatted, leading to improper merging.
• Return statement cleanup: Removed unnecessary return statements in client methods for code clarity and consistency.
• Build script update: Updated the build script to generate both ES modules and CommonJS outputs.
• Dependency updates: Updated and pinned versions for Jest, MSW, and TypeScript to ensure stability and prevent unexpected updates.

Why

These changes are essential to resolve issues with TypeScript type definitions in the Medusa JS SDK, allowing it to properly compile and function with TypeScript support. Additionally, they ensure compatibility with CommonJS-based platforms like Nest.js and provide a more stable development environment.

• CommonJS support: Ensures compatibility with frameworks like Nest.js that rely on CommonJS.
• TypeScript type dependencies: Added required packages to prevent compilation issues and improve IDE support.
• Dependency updates: Pinned versions help avoid unexpected package updates that could introduce breaking changes.

How

The changes were implemented by:

• Adding CommonJS support in the package.json through the module and exports fields.
• Adding necessary TypeScript type packages as dependencies to ensure the SDK compiles correctly.
• Updating the build scripts to output both CommonJS and ES modules.
• Normalizing headers in client request handling to ensure correct merging.
• Cleaning up return statements in client methods.
• Pinning dependency versions for Jest, MSW, and TypeScript to prevent unexpected updates and ensure stability.

Testing

These changes were tested using the existing test suite, which includes:

• Unit tests: Covering client request/response behavior and TypeScript type validation.
• Manual testing: Verified that the SDK compiles correctly with the added TypeScript dependencies and works as expected in a CommonJS environment like Nest.js.

Additional manual tests were performed to validate the correct behavior of the CommonJS integration and dependency updates.

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[SalahAdDin]

It should be better has the config file also in ts.