feat: support pnpm aliases for removing packages

[danielwaltz]

Describe the feature

Currently nypm does not support all the aliases pnpm has available for package removal (pnpm rm, pnpm uninstall, pnpm un).

Would be nice for these to be available for muscle memory! I myself have gotten quite used to using rm. 😆

Planning to PR shortly!

Additional information

• [X] Would you be willing to help implement this feature?