Configurable chat thread limit (#7878)

patches/server/Paper-config-files.patch

@@ -688,6 +688,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public Misc misc;
 +
 +    public class Misc extends ConfigurationPart {
++        public class ChatThreads extends ConfigurationPart.Post {
++            private int chatExecutorCoreSize = -1;
++            private int chatExecutorMaxSize = -1;
++
++            @Override
++            public void postProcess() {
++                // TODO: FILL
++            }
++        }
 +        public int maxJoinsPerTick = 3;
 +        public boolean fixEntityPositionDesync = true;
 +        public boolean loadPermissionsYmlBeforePlugins = true;