`*Client.NewStream()` does not apply metadata to `Request{}`

[amurchick]

*Client.Call() apply metadata to Request{}: https://github.com/containerd/ttrpc/blob/faba5896a9c4d7b65495cb9b2c02531feb1434d6/client.go#L162-L164

But *Client.NewStream() does not have this block - so metadata not applyed.

Please add this block to *Client.NewStream(). Thank you!