Chiseltest JNI Backend

[oliveryu11]

TODOs:

• Add a switch to go between JNI and JNA, via some annotation
• test on other computers and validate via CI
• Remove duplication between JNIUtils and JNAUtils
• Do a final performance benchmark with the GCD test
• clean up code/modified files

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1 out of 2 committers have signed the CLA.

:white_check_mark: vighneshiyer
:x: Oliver Yu

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[ekiwi]

This looks very promising. I left some initial comments. Please ping me when this is ready for a more thorough review.