add method to set processing metadata on scope

Author: lobsterkatie

packages/hub/src/scope.ts

@@ -450,6 +450,15 @@ export class Scope implements ScopeInterface {
     return this._notifyEventProcessors([...getGlobalEventProcessors(), ...this._eventProcessors], event, hint);
   }
 
+  /**
+   * Add data which will be accessible during event processing but won't get sent to Sentry
+   */
+  public setProcessingMetadata(newData: { [key: string]: any }): this {
+    this._processingMetadata = { ...this._processingMetadata, ...newData };
+
+    return this;
+  }
+
   /**
    * This will be called after {@link applyToEvent} is finished.
    */