fix(message) retrieve message method

lib/WetSock/Message.js

@@ -17,7 +17,7 @@ export default class Message {
             this.#message = this.#data.message;
         } catch(err) {
             this.#data = undefined;
-            this.#message = undefined;
+            this.#message = rawText;
         }
     }
 
@@ -40,4 +40,12 @@ export default class Message {
     get(key) {
         return this.#data[key];
     }
+
+    /**
+     * Retrieves the text content.
+     * @returns {string} - the text content of the socket message;
+     */
+    text() {
+        return this.#data.message || '';
+    }
 }