Expose logger instance for development purposes

Related https://github.com/vector-im/element-web/issues/18425

src/@types/global.d.ts

@@ -16,6 +16,7 @@ limitations under the License.
 
 import "matrix-react-sdk/src/@types/global"; // load matrix-react-sdk's type extensions first
 import type { Renderer } from "react-dom";
+import type { logger } from "matrix-js-sdk/src/logger";
 
 type ElectronChannel =
     "app_onAction" |
@@ -36,6 +37,7 @@ type ElectronChannel =
 declare global {
     interface Window {
         mxSendRageshake: (text: string, withLogs?: boolean) => void;
+        matrixLogger: typeof logger;
         matrixChat: ReturnType<Renderer>;
 
         // electron-only