Added styling rules for relationship color (cherrypicked)

[nielsdejong]

Cherry picking commits from https://github.com/mercedes-benz/neodash/tree/VULCAN-171/StylingRulesForRelationships

Original PR:

This pull request adds a way to style relationships using the dashboard json setting as shown in example below:
"styleRules": [
{
"field": "RELATIONSHIP_NAME.propertyName",
"condition": "contains",
"value": "some_string",
"customization": "relationship color",
"customizationValue": "#79AEBF"
}

The styling of widths is not added but should be simple enough to do as well should the need arise. Unfortunately I was not able to add a UI for this to neodash style rule creation modal (the filter for source fields is only nodes at the moment, not sure how we could bring relationships in) - so this is a hidden feature accessible from json definition of a dashboard only.

NOTICE
The program was tested solely for our own use cases, which might differ from yours.

Author Info: Brahm Prakash Mishra [[email protected]](mailto:[email protected]) on behalf of Mercedes-Benz Research and Development India

[https://github.com/mercedes-benz/mercedes-benz-foss/blob/master/PROVIDER_INFORMATION.md](https://github.com/Daimler/daimler-foss/blob/master/PROVIDER_INFORMATION.md)

Licensed under MIT

[codecov]

Codecov Report

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[BennuFire]

I made some modifications in the code in order to allow the use of it from the Style Modal.

[BennuFire]

Should be fine now. Let see if someone else can test it around.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

No Coverage information
0.0% Duplication