feat(core): implement channel invite model

closes #268

crates/core/models/src/v0/channel_invites.rs

@@ -0,0 +1,27 @@
+auto_derived!(
+    /// Invite
+    pub enum Invite {
+        /// Invite to a specific server channel
+        Server {
+            /// Invite code
+            #[cfg_attr(feature = "serde", serde(rename = "_id"))]
+            code: String,
+            /// Id of the server this invite points to
+            server: String,
+            /// Id of user who created this invite
+            creator: String,
+            /// Id of the server channel this invite points to
+            channel: String,
+        },
+        /// Invite to a group channel
+        Group {
+            /// Invite code
+            #[cfg_attr(feature = "serde", serde(rename = "_id"))]
+            code: String,
+            /// Id of user who created this invite
+            creator: String,
+            /// Id of the group channel this invite points to
+            channel: String,
+        },
+    }
+);

crates/core/models/src/v0/mod.rs

@@ -1,4 +1,5 @@
 mod bots;
+mod channel_invites;
 mod channel_webhooks;
 mod channels;
 mod files;
@@ -7,6 +8,7 @@ mod servers;
 mod users;
 
 pub use bots::*;
+pub use channel_invites::*;
 pub use channel_webhooks::*;
 pub use channels::*;
 pub use files::*;