Remove type hints with impossible to import modules

[RecurvedBow]

In typegen, modules of type annotations are imported. However, some type hints can not be imported. An example is the return value of hashlib.sha256(). It is a hash instance defined in CPython and thus can not be imported. To generalize this which type hints should be removed, any module name which contains "-" is not a valid module name. To figure out whether a type hint should be removed, check the module name in imports.py. Parsing using cst.parse_expression(module) will generate a node of type cst.BinaryOperation. Remove such type hints if the name of the module is invalid.

[bengsparks]

Why can this not be imported?

λ python                                
Python 3.10.5 (main, Jun  6 2022, 18:49:26) [GCC 12.1.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from hashlib import sha256
>>> type(sha256)
<class 'builtin_function_or_method'>
>>> type(sha256())
<class '_hashlib.HASH'>

[RecurvedBow]

Unclear why. On tracing the poetry repository, the following warning has been encountered: <class 'libcst._nodes.expression.BinaryOperation'> | lib-dynload._hashlib.cpython-310-x86_64-linux-gnu | HASH. Mark this as obsolete if unable to reproduce.