AK: Add a useful align_up_to(value, power_of_two) function

AK/Types.h

@@ -73,4 +73,9 @@ static_assert(explode_byte(0x80) == 0x80808080);
 static_assert(explode_byte(0x7f) == 0x7f7f7f7f);
 static_assert(explode_byte(0) == 0);
 
+inline constexpr size_t align_up_to(const size_t value, const size_t alignment)
+{
+    return (value + (alignment - 1)) & ~(alignment - 1);
+}
+
 enum class TriState : u8 { False, True, Unknown };