[wpilib] Add function to wait for DS Connection (#5230)

wpilibc/src/main/native/include/frc/DriverStation.h

@@ -296,6 +296,14 @@ class DriverStation final {
    */
   static int GetLocation();
 
+  /**
+   * Wait for a DS connection.
+   *
+   * @param timeout timeout in seconds. 0 for infinite.
+   * @return true if connected, false if timeout
+   */
+  static bool WaitForDsConnection(units::second_t timeout);
+
   /**
    * Return the approximate match time.
    *