Zanshin-sdk-python

Update schedule format to newest required by the API

- New documentation.

Added new features:
- Manage scan target groups (support for Oracle scan target type).
- Missing operations on organizations (create/delete).
- Support for Google Workspace.

* Updated Client methods to include language, search, order and sort parameters when available on the API;
* Fixed type hints in Client._get_alerts_page and Client._get_alerts_following_history_page;
* Added type validation for existing search parameter to ensure it's a string;
* Fixed usage of string enum values in request bodies by using .value.

* New `verify` parameter on client constructor that maps to the equivalent [httpx parameter](https://www.python-httpx.org/advanced/#ssl-certificates).
* Update httpx version.

* Adds support for Python 3.11 and adds it to the Github Actions test matrix.

* Fixes failing unit tests.

* Removes unnecessary dependency `pytest` since tests are using `unittest`.

* Adds input validation to `kind` parameter of `Client.onboard_scan_target` method.