[feature] allow multiple script context roots

[DaPutzy]

Description

Solves #438 (contains additional context).

This feature allows the user to add addtional script context roots to be able to share code/scripts between collections.

Example collection config:

{
  "version": "1",
  "name": "cloud",
  "type": "collection",
  "scripts": {
    "additionalContextRoots": [
      "../scripts"
    ]
  }
}

It supports absolute and relative paths.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

[helloanoop]

Nice @DaPutzy !

Thanks for getting this done!