default ContextAwareExecutorService makeContextAware(ExecutorService executor) {
        return ContextAwareExecutorService.of(this, executor);
    }
Returns a {@link ContextAwareExecutorService} that will execute callbacks in the given {@code executor},
making sure to propagate this {@link RequestContext} into the callback execution.
If this executor service will be used for callbacks from several requests, use
{@link #makeContextPropagating(ExecutorService)} instead.
core/src/main/java/com/linecorp/armeria/common/RequestContext.java