Turn into optional extension json-stream can depend on #23
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This PR aims to turn the Rust tokenizer into an optional extension, meaning that building it from the sdist is allowed to fail. The purpose of this is to allow json-stream to have this package as a dependency but be able to fall back to the pure Python tokenizer if no wheels are available and the sdist build fails.
Maturin doesn't support optional extensions and the recommendation from their side is to use setuptools-rust instead (PyO3/maturin#1081), so that's what we do here as well.
Also gets rid of the dependency on json-stream.