feat: add keepalive to Torii client gRPC connections (#2690)

* add keepalive to WorldClient

* Remove keepalive argument from Torii client and set keep alive to default 30 secs

* Introduce constant for keepalive time + set to 60 secs as per recommended

crates/torii/grpc/src/client.rs

@@ -1,5 +1,6 @@
 //! Client implementation for the gRPC service.
 use std::num::ParseIntError;
+use std::time::Duration;
 
 use futures_util::stream::MapOk;
 use futures_util::{Stream, StreamExt, TryStreamExt};
@@ -50,8 +51,11 @@ pub struct WorldClient {
 impl WorldClient {
     #[cfg(not(target_arch = "wasm32"))]
     pub async fn new(dst: String, world_address: Felt) -> Result<Self, Error> {
-        let endpoint =
-            Endpoint::from_shared(dst.clone()).map_err(|e| Error::Endpoint(e.to_string()))?;
+        const KEEPALIVE_TIME: u64 = 60;
+
+        let endpoint = Endpoint::from_shared(dst.clone())
+            .map_err(|e| Error::Endpoint(e.to_string()))?
+            .tcp_keepalive(Some(Duration::from_secs(KEEPALIVE_TIME)));
         let channel = endpoint.connect().await.map_err(Error::Transport)?;
         Ok(Self {
             _world_address: world_address,