RFR: 8248862: Implement Enhanced Pseudo-Random Number Generators

[Jim Laskey]

This PR is to introduce a new random number API for the JDK. The primary API is found in RandomGenerator and RandomGeneratorFactory. Further description can be found in the JEP https://openjdk.java.net/jeps/356 .

javadoc can be found at http://cr.openjdk.java.net/~jlaskey/prng/doc/api/java.base/java/util/random/package-summary.html

old PR:  https://github.com/openjdk/jdk/pull/1273

-------------

Commit messages:
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862; Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - ... and 15 more: https://git.openjdk.java.net/jdk/compare/f7517386...2b3e4ed7

Changes: https://git.openjdk.java.net/jdk/pull/1292/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1292&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248862
  Stats: 13319 lines in 25 files changed: 11110 ins; 2132 del; 77 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1292.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1292/head:pull/1292

PR: https://git.openjdk.java.net/jdk/pull/1292