Update JSON Forms to 3.2.0-beta.0 (#76)

* update JSON Forms to 3.2.0-beta.0
* Add nvmrc to configure Node 18, remove obsolete lint deps
* Fix and update unit tests

---------

Co-authored-by: Lucas Koehler <lkoehler@eclipsesource.com>

Author: LukasBoll

.gitignore

@@ -26,6 +26,7 @@
 !.vscode/extensions.json
 
 # misc
+/.angular/cache
 /.sass-cache
 /connect.lock
 /coverage

.nvmrc

@@ -0,0 +1 @@
+v18.19.0

angular.json

@@ -78,9 +78,10 @@
         "test": {
           "builder": "@angular-devkit/build-angular:karma",
           "options": {
-            "main": "src/test.ts",
-            "karmaConfig": "./karma.conf.js",
-            "polyfills": "src/polyfills.ts",
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
             "tsConfig": "src/tsconfig.spec.json",
             "scripts": [],
             "styles": [
@@ -91,18 +92,6 @@
               "src/favicon.ico"
             ]
           }
-        },
-        "lint": {
-          "builder": "@angular-devkit/build-angular:tslint",
-          "options": {
-            "tsConfig": [
-              "src/tsconfig.app.json",
-              "src/tsconfig.spec.json"
-            ],
-            "exclude": [
-              "**/node_modules/**"
-            ]
-          }
         }
       }
     },
@@ -117,22 +106,10 @@
             "protractorConfig": "./protractor.conf.js",
             "devServerTarget": "jsonforms-angular-material-playground:serve"
           }
-        },
-        "lint": {
-          "builder": "@angular-devkit/build-angular:tslint",
-          "options": {
-            "tsConfig": [
-              "e2e/tsconfig.e2e.json"
-            ],
-            "exclude": [
-              "**/node_modules/**"
-            ]
-          }
         }
       }
     }
   },
-  "defaultProject": "jsonforms-angular-material-playground",
   "schematics": {
     "@schematics/angular:component": {
       "prefix": "app",