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option to disable mypy caching (#23146)

We do a lot of work (see history of mypy/rules.py) to provide a working
solution for the mypy cache and to move it around between sandboxes
correctly. Unfortunately, sometimes bugs in mypy or Pants prevent the
cache from being viable -- see the looong journey in
https://github.com/pantsbuild/pants/issues/18519 -- and the user might
reasonably want to disable the cache entirely in those situation. (In my
DAYJOB repo for example, the mypy sqlite cache is > 700 MiB which is a
lot of write out and get no value from. They can't do --no-incremental
because that still writes the cache
https://github.com/python/mypy/issues/19489 so we need to facilitate
pointing to /dev/null

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