Bazel: Add support for pytype_binary rule

[ayyar]

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• if this is a _question_ about how to build / test / query / deploy using Bazel, ask it on StackOverflow instead: https://stackoverflow.com/questions/tagged/bazel
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• if this is a _bug_ or _feature request_, fill the form below as best as you can.

Description of the problem / feature request:

Instead of py_binary, pytype_binary would help with type checking. ( See https://github.com/google/pytype )

Feature requests: what underlying problem are you trying to solve with this feature?

Type checking for python using pytype.

[JulesGM]

this would be cool

[blais]

Can we expect integration from bazel or from pytype?
I can't find it in either side.
There's a reference to pytype.bzl here:
https://github.com/google/pytype/commit/83802c65cfcefeded175188502b2dda106d38080
The file is nowhere to be found.
I'd really love pytype_* rules for OSS usage of Bazel...

[dayfine]

Should this be filed under https://github.com/bazelbuild/rules_python/issues instead?

[helinwang]

May I know if there is any update on this? If there any tips of how to contribute to this feature would be helpful too.