Hijri-converter

**IMPORTANT**

The `hijri-converter` package has been **renamed** to `hijridate` in preparation
for the upcoming major update.

Please use a version specifier e.g. `hijridate~=2.3.0` to avoid any breaking
changes in the future.

What's Changed

- Renamed the package to `hijridate` and deprecated the old name.
- Dropped support for Python 3.6 and added support for Python 3.11.
- Updated documentation and removed badges from the package description.
- Updated development configurations and GitHub actions.
- Changed GitHub username back to dralshehri and updated related links.

- Added more classifiers to package configuration.
- Fixed location of type-checking marker file. (By dimbleby in 10)
- Updated development and build requirements.

- Changed GitHub username to mhalshehri and updated related links.
- Changed package docstrings to Google style and updated documentation.
- Updated development workflows and configurations.
- Other minor fixes and enhancements.

- Added some missing variable annotations to `ummalqura` module.
- Fixed an issue when generating documentation.
- Fixed some typos in docstrings and improved documentation.
- Other minor fixes and enhancements.

- Fixed calculation of month 12 of the year 1354 AH.
- Fixed an issue when generating documentation without the package being installed. (7)
- Refactored internal helper functions.
- Updated and improved tests and documentation.
- Fixed some typos.

- Added `today()` classmethod to Hijri class to get the Hijri object of today's date.
- Added `separator` and `padding` parameters to `dmyformat()` method to have more control on formatting.
- Removed deprecated method `slashformat()` from Hijri and Gregorian classes.
- Refactored locales for better management and testing. (Inspired by [Arrow](https://github.com/arrow-py/arrow) localization)
- Updated main classes to be conveniently imported into the package level e.g. `from hijri_converter import Hijri, Gregorian`.
- Updated tests and documentation.
- Other minor fixes and internal enhancements.