feat: add Boolean distribution

include/random/distribution.h

@@ -54,4 +54,10 @@ class Index : public Uniform<size_t> {
 public:
   explicit Index(size_t size) : Uniform(0, size - 1) {}
 };
+
+class Boolean : public Uniform<int> {
+public:
+  Boolean() : Uniform(0, 1) {}
+  void describe(std::ostream &os) const override;
+};
 }

src/distribution.cxx

@@ -46,5 +46,7 @@ template <typename Rand> void Uniform<Rand>::describe(std::ostream & os) const {
   os << typeid(Rand).name() << "Uniform[" << min_ << ',' << max_ << close;
 }
 
+void Boolean::describe(std::ostream &os) const { os << "Boolean"; }
+
 IMPLEMENT_DEVICE(INSTANTIATE_DISTRIBUTION_TEMPLATES)
 }