Common/Random: Add convenience template for simple arithmetic values

In cases where we just want a random value for a primitive arithmetic
type, we can wrap this in a template to allow convenient direct
assignment instead of keeping declaration and initialization separate
(making it more difficult to use values uninitialized). This also allows
the use of Common::Random with functions such as std::generate, making
it more flexible in how random values can be generated.

Source/Core/Common/Random.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <cstddef>
+#include <type_traits>
 
 #include "Common/CommonTypes.h"
 
@@ -12,4 +13,14 @@ namespace Common::Random
 {
 /// Fill `buffer` with random bytes using a cryptographically secure pseudo-random number generator.
 void Generate(void* buffer, std::size_t size);
+
+/// Generates a random value of arithmetic type `T`
+template <typename T>
+T GenerateValue()
+{
+  static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
+  T value;
+  Generate(&value, sizeof(value));
+  return value;
+}
 }  // namespace Common::Random