Remove terminate method from AndroidPlugin

Eliminated the handling of the 'terminate' method call, including the delayed process termination logic, from the AndroidPlugin class.

Author: FeodorFitsner

src/serious_python_android/android/src/main/java/com/flet/serious_python_android/AndroidPlugin.java

@@ -83,13 +83,6 @@ public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
       } catch (Exception e) {
         result.error("Error", e.getMessage(), null);
       }
-    } else if (call.method.equals("terminate")) {
-      // Terminate the process shortly after responding to Dart.
-      result.success(null);
-      new Handler(Looper.getMainLooper()).postDelayed(
-          () -> Process.killProcess(Process.myPid()),
-          100
-      );
     } else {
       result.notImplemented();
     }