Implemented the RandRng sampler based on rand_distr

Author: juntyr

Cargo.lock

@@ -28,6 +28,7 @@ displaydoc = { version = "0.2", default-features = false, features = [] }
 final = "0.1.1"
 fnv = { version = "1.0", default-features = false, features = [] }
 rand_core = "0.6"
+rand_distr = { version = "0.4", default-features = false, features = [] }
 
 [target.'cfg(target_os = "cuda")'.dependencies]
 rust-cuda = { git = "https://github.com/juntyr/rust-cuda", rev = "5d5cd02", features = ["derive"], optional = true }