basilisp-lang / basilisp / #509

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Convert Map to use `immutables.Map` rather than `pyrsistent` (#559)

Convert `basilisp.lang.map.Map` and `basilisp.lang.set.Set` to use `immutables.Map` under the hood, rather than the Python-only implementation provided by `pyrsistent`, which should offer some decent performance improvements for both types.

As another performance improvement, most of the basic runtime functions like `first`, `rest`, `cons`, et al were converted to single dispatch (using `@functools.singledispatch`), which should be a little faster than a series of `isinstance` checks.

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