RNG-191: Dynamically call Math multiply high methods

[aherbert]

Adds unsignedMultiplyHigh methods potentially using native 128-bit multiplication to the Philox4x64 generator.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.56%. Comparing base (1e43bd4) to head (71f49b5).
⚠️ Report is 205 commits behind head on master.

Files with missing lines	Patch %	Lines
...pache/commons/rng/core/source64/PhiloxSupport.java	64.28%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #192      +/-   ##
============================================
- Coverage     99.69%   99.56%   -0.14%     
+ Complexity     1495      813     -682     
============================================
  Files           152      158       +6     
  Lines          5996     6436     +440     
  Branches        564      593      +29     
============================================
+ Hits           5978     6408     +430     
- Misses           12       22      +10     
  Partials          6        6              

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