Check GL08 on class __init__ constructors

I was looking for a way to skip GL08 checks on class constructors (__init__) throughout my code. This is particularly as the numpydoc recommendation for class strings documents the constructor:

Class docstring
Use the same sections as outlined above (all except Returns are applicable). The constructor (__init__) should also be documented here, the Parameters section of the docstring details the constructor’s parameters.

It seems that there ought to be a default check ignore for __init__ constructors if no docstring has been provided (and if a class docstring has been provided). Obviously if an (optional) docstring for __init__ has been created, then it ought to be checked.

This conditional checking doesn't seem possible with the default override_<code>, exclude toml tags.
Keen to hear others thoughts!

Start by tracing the GL08 check and the existing override_ and exclude TOML configuration handling. Determine how to distinguish an undocumented init from one with an explicit docstring when the class has a docstring. Done means the default behavior skips only the former while still checking documented constructors, with the behavior covered by tests.