feature: Add invite maxAge check before attempting to create the invite (#1140)

* Add maxage check & improve maxage parameter check

* Change InvalidOperation to ArgumentOoR

* Remove HasValue check
...since it does it implicitly already.

* Add parameter names & better wording for invite OoR

* Move maxAge check to DiscordRestApiClient for consistency

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -978,6 +978,8 @@ namespace Discord.API
             Preconditions.NotNull(args, nameof(args));
             Preconditions.AtLeast(args.MaxAge, 0, nameof(args.MaxAge));
             Preconditions.AtLeast(args.MaxUses, 0, nameof(args.MaxUses));
+            Preconditions.AtMost(args.MaxAge, 86400, nameof(args.MaxAge),
+                "The maximum age of an invite must be less than or equal to a day (86400 seconds).");
             options = RequestOptions.CreateOrClone(options);
 
             var ids = new BucketIds(channelId: channelId);