[Module] add random module

[khchen]

Base on splitmix64, a fast but non-cryptographic PRNG.

Example:

from random import rand, sample, shuffle

isInteger = true
print(rand(100, isInteger))
print(rand(50..100, isInteger))
print(rand(50..100, isInteger))
print(sample([1, 2, 3, 4, 5]))
print(shuffle([1, 2, 3, 4, 5]))