NadekoBot.Extensions should now be fully annotated with nullable reference types as well as many classes from NadekoBot.Common

src/NadekoBot/Common/NoPublicBotPrecondition.cs

@@ -1,4 +1,5 @@
-using System.Diagnostics.CodeAnalysis;
+#nullable disable
+using System.Diagnostics.CodeAnalysis;
 
 namespace NadekoBot.Common;
 
@@ -14,4 +15,4 @@ public sealed class NoPublicBotAttribute : PreconditionAttribute
         return Task.FromResult(PreconditionResult.FromSuccess());
 #endif
     }
-}
+}