Support timeout assertions for lambdas #3637

Feature summary

I would find it very helpful if there was a way to assert that a block of code runs (succeeds / fails) within a certain time duration (without having to add extra dependencies such as awaitility).
AssertJ already supports such assertions for java.util.concurrent.Future arguments:

assertThat(myFuture).succeedsWithin(Duration.ofMillis(2000));

One can of course convert a lambda into a Future and then use these assertions.
What this feature request is about is avoiding the boilerplate necessary to do that. It is not nice and often not trivial, especially if the code block throws checked exceptions. Basically, I ask for an analogue to jupiters org.junit.jupiter.api.Assertions.assertTimeout.

I think this could work nicely with assertThatCode, but the exact semantics are of course up to you.

Example

assertThatCode(() -> {
	CloseableHttpClient client = HttpClientFactory.getInstance().create();
	HttpRequestUtils rqUtils = new HttpRequestUtils(client);

	assertThat(rqUtils.isAvailable(new URI("http://www.orf.at"))).isTrue();
	assertThat(rqUtils.isAvailable(new URI("www.____NOTEXISTING___.com"))).isFalse();
}).succeedsWithin(Duration.ofMillis(2000));

Motivation:

I often convert projects from hamcrest/jupiter assertions to exclusively use assertJ. Jupiters assertTimeout was the only case I could find so far where convertion to assertJ was not possible without adding significant boilerplate.