Pronotepy

**Changelog**
- bug fixes
- add ENT Essonne
- make Client.lessons more precise

Why `v2.0.0`? There has been a big rework of the data classes system. During the rework some undocumented attributes were removed, and generally pronotepy might behave differently than before. These breaking changes require a new major release.

**Changelog**
- Total rework of data classes. Typing is a lot more strict, we now prefer throwing a `ParsingError` over undefined behaviour
- Changed signature of `Client.information_and_surveys`
- Bug fixes

Publish python package. Version bump commit got delayed and wasn't in the v1.5.0 release, causing the workflow to fail...

**Changelog**
- Added ENTs `ParrisClasseNumerique` and `MonBureauNumerique`
- Added `num` attribute to `Lesson`
- Added support for data from the "Informations & Sondages" tab

**Changelog**
- Fixed bug regarding pronotepy.Student

**Changelog**
- Added ENT Orleans-Tours
- Refactoring
- Added VieScolaireClient and multiple data classes for managing students and their guardians