refactor(sdk): convert InvalidGameStateException to kotlin

Author: anarchuser

socha-sdk/src/framework/sc/shared/InvalidGameStateException.java renamed to socha-sdk/src/framework/sc/shared/InvalidGameStateException.kt

@@ -1,14 +1,10 @@
-package sc.shared;
+package sc.shared
+
+import kotlin.RuntimeException
 
 /**
  * This exception is thrown if the server tried to create an invalid game state.
  * This indicates an error in the server or plugin code. It should never be
  * thrown on invalid input to the server (i.e. invalid move made).
  */
-public class InvalidGameStateException extends RuntimeException {
-
-  public InvalidGameStateException(String reason) {
-    super(reason);
-  }
-
-}
+class InvalidGameStateException(reason: String): RuntimeException(reason)