Add @DisplayName support for JUnit 5

[jdneo]

From @smoyer64 in #93 (comment):

After running a few more JUnit5 tests through VS Code's Java test extension I've also realized that the @DisplayName annotations are not being used when present. I can submit a separate issue for this problem if you want (along with a small code sample and Eclipse output.

[jdneo]

Thanks for @BaerMitUmlaut contributes the support in #357

Another potential work is that we might also need to show the display name in the test report. @smoyer64 any idea for this?

[smoyer64]

@jdneo ... I was on vacation but wanted to (after the fact) let you know that it looks good to me!

[jdneo]

@smoyer64 Thanks. 😄