Implement RandomGenerator default methods up to Java 17

[zbynek]

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/random/RandomGenerator.html

These are currently missing:

java.util.random.RandomGenerator#getDefault()\
java.util.random.RandomGenerator#of(String)\
java.util.random.RandomGenerator#nextDouble(double)\
java.util.random.RandomGenerator#nextDouble(double, double)\
java.util.random.RandomGenerator#nextInt(int, int)\
java.util.random.RandomGenerator#ints(int, int)\
java.util.random.RandomGenerator#ints()\
java.util.random.RandomGenerator#ints(long)\
java.util.random.RandomGenerator#ints(long, int, int)\
java.util.random.RandomGenerator#longs(long, long, long)\
java.util.random.RandomGenerator#longs(long, long)\
java.util.random.RandomGenerator#longs()\
java.util.random.RandomGenerator#longs(long)\
java.util.random.RandomGenerator#doubles()\
java.util.random.RandomGenerator#doubles(long, double, double)\
java.util.random.RandomGenerator#doubles(double, double)\
java.util.random.RandomGenerator#doubles(long)\
java.util.random.RandomGenerator#nextLong(long, long)\
java.util.random.RandomGenerator#nextLong(long)\
java.util.random.RandomGenerator#nextFloat(float)\
java.util.random.RandomGenerator#nextFloat(float, float)\
java.util.random.RandomGenerator#nextGaussian(double, double)\
java.util.random.RandomGenerator#isDeprecated()\
java.util.random.RandomGenerator#nextExponential()