Rust cli

[willcl-ark]

• [x] Commands implemented except graph validate are working. Converting an xml graphml file to json seems to be a bit of a pain for validation
• [x] added a --rust_cli matrix to tests on rpc tests, which will (lightly) test the new tool
• [x] pretty print warnet table repr in network start command
• [ ] quickxml-to-serde pulls in a different xml lib than we use xmltree, could possibly use the same as them?
• [x] implement the image commands
• [ ] write some tests
• [ ] @pinheadmz slightly scary-looking graph import-json not implemented yet.

Notes:

• Graphs are generated with some kind of randomness in the tagging, which looks weird, but works fine.

[willcl-ark]

I think if it made sense, we could perhaps strip out deps on jsonrpsee and tokio, and use a more rdimentary JSONRPC client, possibly something more like this: https://github.com/apoelstra/rust-jsonrpc