Add builder generation on install/add

[kaltepeter]

Support installing or adding with --project flag to generate build-icons config in angular.json

Would be nice if schema matched the three possible conversionTypes.

Relates to #9

Sample for constants:

     "update-icons": {
          "builder": "@angular-extensions/svg-icons-builder:svg-icons-builder",
          "options": {
            "conversionType": "constants",
            "srcFiles": ["./projects/dinosaur-icons/icons/**/*.svg"],
            "outputDirectory": "./projects/dinosaur-icons/icons",
            "interfaceName": "DinosaurIcon",
            "typeName": "dinosaurIcon",
            "prefix": "dinosaurIcon",
            "modelFileName": "dinosaur-icons",
            "svgoConfig": {
              "plugins": [
                {
                  "cleanupAttrs": true
                }
              ]
            },
            "additionalModelFile": "./projects/dinosaur-icons/src/lib",
            "compileSources": true
          }
        },

[kaltepeter]

@kreuzerk thoughts on this?

[nivekcode]

Definitely. This would be very nice. It would be nice that the ng-add command asks for the various properties. I am not yet sure how we can make this conditional - so for example that ng-add asks you for the conversionType. Based on that it should then aks for the correct options and then automatically configure the builder in the angular.json

[kaltepeter]

Yeah, I am not 100% certain either. It seems do-able to conditionally drive the builder called.