Add mypy_version to config_type

Feature

Propose to add mypy_version similar to python_version in config_type from mypy/config_parser.py - to indicate which mypy version is recommended when parsing a config file.

Pitch

When developer create the mypy config file, there's no way to indicate which mypy version was used during the development. This could create confusion when different developers installed different versions of mypy while working on the same project.

with mypy_version one can specify the agreed upon mypy_version to be used when parsing a config file. It should print warning/error message when the desired mypy version specified is not the same as the one installed.

Alternative

One could use the package manager config to specify desire mypy version, e.g. requirements.txt. but it doesn't warn developer when a wrong version was installed/used.

Comienza en mypy/config_parser.py, en config_type, y compara la configuración propuesta con el manejo de python_version. Sigue cómo se analizan los valores de configuración y cómo se informan los diagnósticos de versión; después, aclara si una discrepancia debería producir una advertencia o un error. La tarea estará terminada cuando las versiones de mypy coincidentes y no coincidentes se gestionen y estén cubiertas por pruebas del parser.