tree-editor: add missing jsonforms peer dependencies (#174)

The tree editor framework was updated to require jsonforms as peer dependencies instead of direct dependencies.
Thus, they were no longer installed. This commit adds them to the generated tree extension.

See also eclipse-emfcloud/theia-tree-editor#78

Contributed on behalf of STMicroelectronics

Signed-off-by: Lucas Koehler <lkoehler@eclipsesource.com>

src/app/index.ts

@@ -247,7 +247,7 @@ module.exports = class TheiaExtension extends Base {
         this.params.dependencies = '';
         this.params.browserDevDependencies = '';
         if (this.params.extensionType === ExtensionType.TreeEditor) {
-            this.params.dependencies = `,\n    "@theia/editor": "${this.params.theiaVersion}",\n    "@theia/filesystem": "${this.params.theiaVersion}",\n    "@theia/workspace": "${this.params.theiaVersion}",\n    "@eclipse-emfcloud/theia-tree-editor": "next",\n    "uuid": "^3.3.2"`;
+            this.params.dependencies = `,\n    "@theia/editor": "${this.params.theiaVersion}",\n    "@theia/filesystem": "${this.params.theiaVersion}",\n    "@theia/workspace": "${this.params.theiaVersion}",\n    "@eclipse-emfcloud/theia-tree-editor": "next",\n    "@jsonforms/core": "^3.1.0",\n    "@jsonforms/react": "^3.1.0",\n    "@jsonforms/vanilla-renderers": "^3.1.0",\n    "uuid": "^3.3.2"`;
         }
         if (this.params.extensionType === ExtensionType.Widget) {
             this.params.devdependencies = `,\n    "@testing-library/react": "^11.2.7",\n    "@types/jest": "^26.0.20",\n    "jest": "^26.6.3",\n    "ts-node": "^10.9.1",\n    "ts-jest": "^26.5.6"`;