docs: event stream typed document (#29109)

[Roiocam]

References #29109

[Roiocam]

close-reopen to retrigger paused CI.

[Roiocam]

PR passed. Let's take a look at these typed cases to see if they are correct.

[johanandren]

Looking good, I left some smaller feedback

[johanandren]

The div { group-java/scala } blocks doesn't lead to a tabbed code box, which is especially unfortunate as. a first code snippet, better turn them into complete regular code snippet blocks and either have the text "it can be subscribed like this" inbetween for both Scala and Java with a second code snippet for subscribing for both languages, or put it all in one code block and skip that text.

Suggested change

	@@@ div { .group-java }
	@@snip [LoggingDocTest.java](/akka-actor-typed-tests/src/test/java/akka/actor/typed/eventstream/LoggingDocTest.java) { #imports-deadletter }
	@@snip [LoggingDocTest.java](/akka-actor-typed-tests/src/test/java/akka/actor/typed/eventstream/LoggingDocTest.java) { #deadletter-actor }
	it can be subscribed like this:
	@@snip [LoggingDocTest.java](/akka-actor-typed-tests/src/test/java/akka/actor/typed/eventstream/LoggingDocTest.java) { #deadletters }
	@@@
	Java
	: @@snip [LoggingDocTest.java](/akka-actor-typed-tests/src/test/java/akka/actor/typed/eventstream/LoggingDocTest.java) { #imports-deadletter #deadletter-actor #deadletters }

[Roiocam]

You are correct, however, this div { group-java/scala } block will still follow tab switching.

Therefore, we will add a Tabbed to the first snippet of this block and retain the div { group-java } only, as it is not allowed to combine imports and class definitions in Java (it would be broken by the format plugin).

I have pushed a commit to explain this, and the final result is like this on my PC, I think this will be better. :)

[johanandren]

Ok, that is better, the big problem was the first code snippet in the page not having the tabs.

[johanandren]

LGTM, thanks!