Implement basic chat functionality

rc_chat_room/src/persist/chat_user/traits.rs

@@ -0,0 +1,8 @@
+use polariton::operation::Typed;
+
+pub trait ChatUser {
+    fn subscribed_channels(&self) -> Typed<()>;
+    fn subscribed_channels_strings(&self) -> Vec<String>;
+    fn add_subscribed_channel(&self, channel: String, channel_ty: crate::data::channel::ChatChannelType) -> Typed<()>;
+    fn remove_subscribed_channel(&self, channel: String, channel_ty: crate::data::channel::ChatChannelType) -> bool;
+}