Nx Streaming Integration

### Nx Streaming Integration

Expand Nx interoperability.

Support:

* streaming tensors
* chunk-to-tensor conversion
* lazy tensor pipelines

Examples:

```elixir
array
|> ExZarr.Array.stream_chunks()
|> Stream.map(&Nx.tensor/1)
```

Create:

```
livebooks/nx_streaming.livemd
```