tsp install should follow current user package manager

[timotheeguerin]

Clear and concise description of the problem

Currently tsp install is just using npm install blindly. We are able to figure out which package manager the user is using relatively easily so we can shell to the correct one.

This will also enable the IDE to be able to depend on it for the init phase.

Checklist

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[markcowl]

est: 8