add support for configuring max frame size

- Adds `max_frame_size` to client and server builders
- Pushes max_frame_size into Codec
- Detects when the Codec triggers an error from a frame too big
- Sends a GOAWAY when FRAME_SIZE_ERROR is encountered reading a frame

tests/codec_read.rs

@@ -110,22 +110,24 @@ fn read_headers_empty_payload() {}
 
 #[test]
 fn update_max_frame_len_at_rest() {
+    let _ = ::env_logger::init();
     // TODO: add test for updating max frame length in flight as well?
     let mut codec = raw_codec! {
         read => [
             0, 0, 5, 0, 0, 0, 0, 0, 1,
             "hello",
-            "world",
+            0, 64, 1, 0, 0, 0, 0, 0, 1,
+            vec![0; 16_385],
         ];
     };
 
     assert_eq!(poll_data!(codec).payload(), &b"hello"[..]);
 
-    codec.set_max_recv_frame_size(2);
+    codec.set_max_recv_frame_size(16_384);
 
-    assert_eq!(codec.max_recv_frame_size(), 2);
+    assert_eq!(codec.max_recv_frame_size(), 16_384);
     assert_eq!(
         codec.poll().unwrap_err().description(),
-        "frame size too big"
+        "frame with invalid size"
     );
 }