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/node.proto

@@ -0,0 +1,36 @@
+syntax = "proto3";
+
+message TypedValue {
+	enum Type {
+		String = 0;
+		Number = 1;
+		Object = 2;
+		Boolean = 3;
+	}
+	Type type = 1;
+	string value = 2;
+}
+
+message NewEvalMessage {
+	uint64 id = 1;
+	string function = 2;
+	repeated string args = 3;
+	// Timeout in ms
+	uint32 timeout = 4;
+}
+
+message EvalFailedMessage {
+	uint64 id = 1;
+	enum Reason {
+		Timeout = 0;
+		Exception = 1;
+		Conflict = 2;
+	}
+	Reason reason = 2;
+	string message = 3;
+}
+
+message EvalDoneMessage {
+	uint64 id = 1;
+	TypedValue response = 2;
+}