Introduce mechanism to enable specific global extensions in JUnit Jupiter

[translatenix]

Enabling all global extensions on the class/module path with junit.jupiter.extensions.autodetection.enabled=true is asking for surprises (and potentially trouble).

Instead, I'd like to explicitly enable the global extensions that I want to use.

I imagine that I'd do this by setting junit.jupiter.extensions.autodetection.enabled=foo.bar.Baz,foo.bar.Qux or a similar property.

If the JUnit team is open to this idea, I'd be happy to discuss further and send a PR.

[sbrannen]

Thanks for the proposal, @translatenix.

We'll discuss it within the team during an upcoming team call and get back to you.

[marcphilipp]

Team decision: Introduce junit.jupiter.extensions.autodetection.include and junit.jupiter.extensions.autodetection.exclude configuration parameters with defaults of * and empty, respectively.

[marcphilipp]

Addendum: The new properties should support the same pattern matching syntax supported for other configuration parameters.

[bjmi]

One use case would be to enable org.mockito.junit.jupiter.MockitoExtension from org.mockito:mockito-junit-jupiter globally by default. This would activate strict stubbing then. mockito/mockito#769.