Add Node package manager detection

[loadinglucian]

Instead of falling back to NPM, detect and prioritize faster package managers (Bun > PNPM > Yarn) over NPM:

• Added isAvailable() and detect() methods in the NodePackageManager
• NewCommand tries to detect the best available package manager instead of defaulting to NPM
• Added tests/NodePackageManagerTest.php to verify the detection and availability logic.

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!