feat(@schematics/angular): add support for ShadowDom as a viewEncapsulation value

Author: alan-agius4

packages/schematics/angular/application/schema.json

@@ -36,7 +36,7 @@
     },
     "viewEncapsulation": {
       "description": "Specifies the view encapsulation strategy.",
-      "enum": ["Emulated", "Native", "None"],
+      "enum": ["Emulated", "Native", "None", "ShadowDom"],
       "type": "string"
     },
     "routing": {

packages/schematics/angular/component/schema.json

@@ -39,7 +39,7 @@
     },
     "viewEncapsulation": {
       "description": "Specifies the view encapsulation strategy.",
-      "enum": ["Emulated", "Native", "None"],
+      "enum": ["Emulated", "Native", "None", "ShadowDom"],
       "type": "string",
       "alias": "v"
     },

packages/schematics/angular/ng-new/schema.json

@@ -85,7 +85,7 @@
     },
     "viewEncapsulation": {
       "description": "Specifies the view encapsulation strategy.",
-      "enum": ["Emulated", "Native", "None"],
+      "enum": ["Emulated", "Native", "None", "ShadowDom"],
       "type": "string"
     },
     "version": {