feat: rename, deletion, and validation support

Closes #1599
Closes #1825
Closes #649
Closes #1847
Closes #1882

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/widgets/cloud-sketchbook/cloud-sketch-cache.ts

@@ -39,4 +39,11 @@ export class SketchCache {
   getSketch(path: string): Create.Sketch | null {
     return this.sketches[path] || null;
   }
+
+  toString(): string {
+    return JSON.stringify({
+      sketches: this.sketches,
+      fileStats: this.fileStats,
+    });
+  }
 }