Medusa System Added

Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)

src/NadekoBot/Common/Medusa/Models/ParamData.cs

@@ -0,0 +1,9 @@
+namespace Nadeko.Medusa;
+
+public sealed record ParamData(
+    Type Type,
+    string Name,
+    bool IsOptional,
+    bool IsLeftover,
+    bool IsParams
+);