feat: add method for manually retrieving the TextState

In case you do something asynchronous inside a Command, e.g. starting an image upload it is necessary to get the state which could change between starting the asynchronous operation and finishing the asynchronous operation.

src/commandOrchestrator.ts

@@ -24,6 +24,10 @@ export class TextAreaTextApi implements TextApi {
     this.textArea.selectionEnd = selection.end;
     return getStateFromTextArea(this.textArea);
   }
+
+  getState(): TextState {
+    return getStateFromTextArea(this.textArea);
+  }
 }
 
 export function getStateFromTextArea(textArea: HTMLTextAreaElement): TextState {