Restore deleted method

Signed-off-by: Slimane AMAR <amarsli@gm0winl104.bureau.si.interne>

src/main/java/com/powsybl/ws/commons/computation/service/AbstractComputationObserver.java

@@ -53,6 +53,10 @@ protected Observation createObservation(String name, AbstractComputationRunConte
         return observation;
     }
 
+    public <T, E extends Throwable> T observe(String name, AbstractComputationRunContext<P> runContext, Observation.CheckedCallable<T, E> callable) throws E {
+        return createObservation(name, runContext).observeChecked(callable);
+    }
+
     public <E extends Throwable> void observe(String name, AbstractComputationRunContext<P> runContext, Observation.CheckedRunnable<E> callable) throws E {
         createObservation(name, runContext).observeChecked(callable);
     }