Flask-mailing

- `Added` compatibility for Pydantic V2.
- `Fixed` several bugs.

- `Updated` setup.py.
- `Updated` Readme file.
- `Fixed` version number issue.
- `Added` the compatibility for Python 3.11.

- `Fixed` aioredis issue with python 3.11.
- `Fixed` httpx library issue.

- `Added` `send_mail`, `send_mass_mail` methods very similar to `Django` or `Flask-Mailman`.
- `Added` more docstrings for better understanding of all the apis.
- `Added` few more test cases.
- `Fixed` major bug at `MAIL_START_TLS`/`MAIL_START_SSL` configuration at `ConnectionConfig`.

- `Fixed` broken test cases for fake redis client.
- `Fixed` some typo at `utils.email_check` file.
- `Added` `aioredis > 2.0.0` compatibility.
- `Added` fully asynchronous support for `utils.email_check.EmailChecker` class.
- `Updated` the `utils.email_check.EmailChecker` class for the new version of `aioredis`.
- `Updated` the required dependencies.

- `Fixed` issue 20 . Now the user can pass template parameters by using `template_params` variable on the `schemas.Message` class.
- `Fixed` major typo at setup.py
- `Fixed` some broken test cases.
- `Fixed` the Variable name issue at `config.ConnectionConfig` class.
- `Fixed` Literal import for Python 3.6 and 3.7

- `Added` module docstring.
- `Added` `future roadmap` on the docs.
- `Added` some more test cases.
- `Added` the compatibility for Python 3.10
- `Added` the feature to allow users to create custom headers for attachments.

- `Updated` the `MANIFEST.in` file.
- `Updated` the required dependencies.