Midaspy

- Adds support for Python 3.9 and 3.10
- Addresses deprecation warnings and other minor bug fixes
- Resolves dependency issues and includes an updated `setup.py` file
- Adds GitHub Actions workflows that trigger automatic tests on the latest Ubuntu, macOS, and Windows for Python versions 3.7 to 3.10 each time a push or pull request is made to the main branch
- An additional Jupyter Notebook example that demonstrates the core functionalities of **MIDASpy**

This release updates the package dependencies to allow for installation on Apple Silicon (i.e. arm64-based) Macs that require "tensorflow-macos" rather than "tensorflow".

What's Changed
* A few small commits by David-Woroniuk in https://github.com/MIDASverse/MIDASpy/pull/26
* Upgrade to v1.2.2 by tsrobinson in https://github.com/MIDASverse/MIDASpy/pull/27

New Contributors
* David-Woroniuk made their first contribution in https://github.com/MIDASverse/MIDASpy/pull/26

**Full Changelog**: https://github.com/MIDASverse/MIDASpy/compare/v1.2.1...v1.2.2

* Introduces two preprocessing functions: `binary_conv()` and `cat_conv()`
* Adds multiple regression function `combine()`
* Minor changes to plotting

Minor fix to `os` dependency in setup.py

Updates MIDASpy to fully support TensorFlow 2 API.