Add automatic install and build for plugins

[Bassel17]

What does it do?

• Made it so we install and build plugins
• we use the preferred package manager or the explicitly chosen package manager

How to test it?

• if you run the init command in a strapi project:

  • the strapi project package manager will be used

• if you use the --use-yarn, --use-pnpm or --use-npm :

  • the chosen package manager will be used

• you use --no-install to avoid installing (it installs and builds by default)

• your preferred system packageManager will be used automatically

running those commands should be successful

Related issue(s)/PR(s)

fixes #34

[changeset-bot]

🦋 Changeset detected

Latest commit: 18d249f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@strapi/sdk-plugin	Minor

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[innerdvations]

Works for me!