feat(version): add json option to version command

[amorscher]

Outputs projects which reveive a new version in json format.

Description

Follwoing json format is supported:

[
  {
    "name": "footer",
    "version": "0.0.4",
    "private": false,
    "location": "/home/ammo/git/lerna-getting-started-example/packages/footer",
    "newVersion": "0.0.5"
  },
  {
    "name": "header",
    "version": "0.0.4",
    "private": false,
    "location": "/home/ammo/git/lerna-getting-started-example/packages/header",
    "newVersion": "0.0.5"
  },
  {
    "name": "remixapp",
    "version": "0.0.4",
    "private": true,
    "location": "/home/ammo/git/lerna-getting-started-example/packages/remixapp",
    "newVersion": "0.0.5"
  }
]

Motivation and Context

#3720

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (change that has absolutely no effect on users)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[fahslaj]

This is looking good @amorscher !

[amorscher]

@fahslaj I just wanted to add some more unit and at least one e2e test.

[amorscher]

Should be fine now.

[fahslaj]

Thanks @amorscher !