Feature parity to angular-cli: `stylePreprocessorOptions.includePaths`

Type of Issue

[ ] Bug Report
[x ] Feature Request

Description

First let me say a big thank you for your work!

Angular-cli allows to add include-paths for the style-preprocessor in use:

      "stylePreprocessorOptions": {
        "includePaths": [
          "styles"
        ]
      },

In the scss / less files, you don’t have to provide the complete relative path to an import.

How To Reproduce

Add the includePath to angular-cli.json and add an import to a file in your styles-folder without specifying the complete relative path.

Expected Behaviour

As angular-cli itself resolves the import correctly, ng-packagr should do it, too.

Version Information

ng-packagr: v1.6.0
node: v8.7.0
@angular: v5.0.0

[mlc-mlapis]

@picheli20 … it is not directly joined with CLI, ng-packagr has to work as a standalone tool.

[github-actions[bot]]

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