feat(gateway): add cache event handler stubs

gateway/src/evt.rs

@@ -7,6 +7,8 @@ use tracing::info;
 use twilight_gateway::Event;
 use twilight_http::Client as HttpClient;
 
+use crate::cache;
+
 lazy_static::lazy_static! {
     static ref ALLOWED_EVENTS: Vec<&'static str> = [
         "INTERACTION_CREATE",
@@ -25,6 +27,8 @@ pub async fn handle_event<'a>(
     _db: Pool,
     rconn: redis::Client
 ) -> anyhow::Result<()> {
+    cache::handle_event(event.clone(), rconn.clone()).await?;
+
     match event {
         Event::GatewayInvalidateSession(resumable) => {
             info!("shard {} session invalidated, resumable? {}", shard_id, resumable);