default <T, R> Function<T, R> makeContextAware(Function<T, R> function) {
        return ContextAwareFunction.of(this, function);
    }
Returns a {@link ContextAwareFunction} that makes sure the current {@link RequestContext} is
set and then invokes the input {@code function}.
core/src/main/java/com/linecorp/armeria/common/RequestContext.java