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- TypedDict is provided by the typing module for python >= 3.8
- TypedDict is provided by the typing_extensions module for typing_extensions >=
  3.7.4

but this module is not available as debian buster package.

- mypy does not support condition types defined like that:

```
if CONDITION:
    type = Dict
else:
    type = TypedDict
```

and therefore it's not possible to conditionally declare the type.

but… it does support checks with python version or system platform (cf:
https://mypy.readthedocs.io/en/stable/common_issues.html#python-version-and-system-platform-checks).

Let's import TypedDict from typing when it's available (python >= 3.8), and use
it. Otherwise, let's use a simple dict.

related #9

fix([debian]): python3-logilab-common: debian-changelog-file-contains-invalid-email-address schabot@wilson

It breaks CW because CW was using class_deprecated in a isinstance to select
the good views to uses.

for python < 3.6 those two types are not defined. In case of import error, let's
define them (in the exact same way they are defined in the re module of python
>= 3.7).

Otherwise donc cachedproperty.__doc__ returns "property" and not the expected docstring.

functools.wraps was breaking the behavior of LazyObject because it tried to
access attributes of the LazyObject that triggers an import which could
sometime fails in this situation where some modules are marked as deprecated
but aren't imported yet.

For example see https://forge.extranet.logilab.fr/cubicweb/cubicweb/blob/3.24.0/cubicweb/schemas/__init__.py#L51

(removed in
46942c92b211)