feat: parse and validate events from websockets

Establishes a websocket listener, parses events, and performs
validation to ensure valid signatures.

src/conn.rs

@@ -0,0 +1,22 @@
+//use std::collections::HashMap;
+use uuid::Uuid;
+
+// state for a client connection
+pub struct ClientConn {
+    _client_id: Uuid,
+    // current set of subscriptions
+    //subscriptions: HashMap<String, Subscription>,
+    // websocket
+    //stream: WebSocketStream<TcpStream>,
+    _max_subs: usize,
+}
+
+impl ClientConn {
+    pub fn new() -> Self {
+        let client_id = Uuid::new_v4();
+        ClientConn {
+            _client_id: client_id,
+            _max_subs: 128,
+        }
+    }
+}