chore(package.json): add packageManager [email protected], remove engines

[sukvvon]

What:

• add packageManager [email protected], remove engines in package.json

Why:

• the engines key means forcing a specific version. currently, we are only forcing pnpm, which means that versions of npm, yarn, node, etc., are not enforced. we do not want to enforce a version and only want a development environment, so I think it’s correct to remove the engines field and add packageManager instead

How:

• removing the engines field provides flexibility for users to choose their package manager while using the packageManager field ensures a consistent development environment for developers.

Checklist:

• Documentation
• Tests
• Ready to be merged
  

[bvaughn]

I want to enforce pnpm version because I sometimes forget which version a particular project of mine is using and it has caused my trouble. Thanks though