[Bundle] auto-tag services

[dkarlovi]

In the compiler pass:

        $container->registerForAutoconfiguration(PsrProcessor::class)
            ->addTag('enqueue.client.processor');
        // etc...

[dkarlovi]

Note, the service is (at least currently, see #410) expected to be made public.

[makasim]

Could you work on a PR?

[makasim]

There is a PR: #452