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	94	98	96	96
After	32	32	31	32
Savings				64
%				67

Testing done

All existing tests pass

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[gounthar]

Thanks a lot for this contribution.
Let me try that on other machines with less muscle, to see if I can see an improvement too, or if that kills the machine. 😉

[gounthar]

It works for me, thanks.