feat: initial async redis cluster commands

[kangadrewie]

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[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

cwltool (https://github.com/common-workflow-language/cwltool)
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schema_salad (https://github.com/common-workflow-language/schema_salad)
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+ schema_salad/metaschema.py:131: note: ... from here:
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+ schema_salad/metaschema.py:131: note: ... from here:
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+ schema_salad/metaschema.py:131: note: ... from here: