expand package manager options for init scaffolding

[thescientist13]

Summary

pnpm is an incredibly popular manager rising in popularity and such I think it warrants including it as a prompt in the init scaffolding package.

For npm we should also do this

1. --legacy-peer-deps flag when running npm i
2. Add an .npmrc file to the output

Details

And to make it easier, we should probably just prompt for them all

? What package manager would you like to use? (Use arrow keys)
❯ npm (default)
❯ pnpm
❯ yarn 1.x

Should wait until #1270 is completed