hydroflow 0.10.0

Hydro's low-level dataflow runtime and IR
Documentation 
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Simple echo server example.

To run the example, open 2 terminals.

In one terminal run the server like so:
```
cargo run -p hydroflow --example echoserver -- --role server --addr localhost:12347
```

In another terminal run a client:
```
cargo run -p hydroflow --example echoserver -- --role client --server-addr localhost:12347
```

If you type in the client terminal the message will be sent to the server, echo'd back to the client and printed with a checksum and server timestamp.

Adding the `--graph <graph_type>` flag to the end of the command lines above will print out a node-and-edge diagram of the program. Supported values for `<graph_type>` include [mermaid](https://mermaid-js.github.io/) and [dot](https://graphviz.org/doc/info/lang.html).