Implement fs module (#3)

* Implements the fs module

* Add stats object

* Add not implemented to createWriteStream

* Update mkdtemp to use tmp dir

* Unexport Stats

* Add client web socket for commands and restructure

packages/protocol/src/proto/client.proto

@@ -0,0 +1,31 @@
+syntax = "proto3";
+import "command.proto";
+import "node.proto";
+
+message ClientMessage {
+	oneof msg {
+		// command.proto
+		NewSessionMessage new_session = 1;
+		ShutdownSessionMessage shutdown_session = 2;
+		WriteToSessionMessage write_to_session = 3;
+		CloseSessionInputMessage close_session_input = 4;
+		ResizeSessionTTYMessage resize_session_tty = 5;
+	
+		// node.proto
+		NewEvalMessage new_eval = 6;
+	}
+}
+
+message ServerMessage {
+	oneof msg {
+		// command.proto
+		NewSessionFailureMessage new_session_failure = 1;
+		SessionDoneMessage session_done = 2;
+		SessionOutputMessage session_output = 3;
+		IdentifySessionMessage identify_session = 4;
+	
+		// node.proto
+		EvalFailedMessage eval_failed = 5;
+		EvalDoneMessage eval_done = 6;
+	}
+}