Add API calls and their infrastructure

- Add dependencies
- Add authentification (email, password)
- Add token request
- Fetch /self
- Fetch /conversations
- Add infrastructure for above
- Add auth example

examples/auth.rs

@@ -0,0 +1,17 @@
+use irssi_wire::net::wire_api::auth::*;
+use irssi_wire::net::wire_api::conversations::*;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut client = WireClient::new(
+        String::from("marco_thomas@genua.de"),
+        String::from("MarcMK1337#"),
+        Config::Default,
+    );
+
+    let auth_response = client.authentification().await.unwrap();
+
+    let conversations = client.fetch_conversations(&auth_response).await.unwrap();
+
+    Ok(())
+}