remoting: Allow Add/Remove remote folder (#14532)

Release Notes:

- remoting (alpha only): Allow add/remove folders to projects

---------

Co-authored-by: Max <max@zed.dev>

crates/collab/src/rpc/connection_pool.rs

@@ -38,6 +38,10 @@ impl ZedVersion {
     pub fn with_save_as() -> ZedVersion {
         ZedVersion(SemanticVersion::new(0, 134, 0))
     }
+
+    pub fn with_list_directory() -> ZedVersion {
+        ZedVersion(SemanticVersion::new(0, 145, 0))
+    }
 }
 
 pub trait VersionedMessage {
@@ -187,6 +191,18 @@ impl ConnectionPool {
         self.connected_dev_servers.get(&dev_server_id).copied()
     }
 
+    pub fn dev_server_connection_id_supporting(
+        &self,
+        dev_server_id: DevServerId,
+        required: ZedVersion,
+    ) -> Result<ConnectionId> {
+        match self.connected_dev_servers.get(&dev_server_id) {
+            Some(cid) if self.connections[cid].zed_version >= required => Ok(*cid),
+            Some(_) => Err(anyhow!(proto::ErrorCode::RemoteUpgradeRequired)),
+            None => Err(anyhow!(proto::ErrorCode::DevServerOffline)),
+        }
+    }
+
     pub fn channel_user_ids(
         &self,
         channel_id: ChannelId,