chore: Parallelize Tests

[rahulsom]

This will use all available cores to run tests, and parallelize by all - suite/class/method. On machines with multiple cores, this will vastly improve test performance. These times are on my M1 MBP with 10 (8P + 2E) cores. They were reported by maven on running mvn verify.

I first ran mvn verify and ignored the time.
Then I ran it thrice without this change, and thrice with this change.

All times in seconds.

	Run 1	Run 2	Run 3	Average
Before	49	50	49	49
After	22	22	22	22
Savings				27
%				55

Testing done

All existing tests pass

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5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[timja]

FYI your git author settings are broken, did you want to fix them or should I merge all your PRs?

Co-authored-by: Name From Git-Plugin-Test <[email protected]>

[rahulsom]

Yikes. I'll fix it. Thanks!