feat: export scene to e+ on workspace creation/redemption (#8514)

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/errors.ts

@@ -50,6 +50,7 @@ export class WorkerUrlNotDefinedError extends Error {
     this.code = code;
   }
 }
+
 export class WorkerInTheMainChunkError extends Error {
   public code;
   constructor(
@@ -61,3 +62,14 @@ export class WorkerInTheMainChunkError extends Error {
     this.code = code;
   }
 }
+
+/**
+ * Use this for generic, handled errors, so you can check against them
+ * and rethrow if needed
+ */
+export class ExcalidrawError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = "ExcalidrawError";
+  }
+}