…ns of Python

* Added Python 3.12 to test suite
* Removed support for Python 3.7. Per Python maintainers, 3.7 is EOL and no longer receiving security updates
* Excluded additional files that need not trigger tests.
* Optimized error checking and introduced common.py enabling method extractions for common code.
* Minor import optimizations
* Minor linting fixes
* Fixed missing NETWORK_DELETE_RETRY_WAIT_TIME argument in meraki/__init__.py
* Minor syntactical improvements for README.md

The AIO library uses aiohttp which does not have a production-ready wheel for Python 3.12 yet. We should reconsider 3.12 support once a production-ready wheel exists for aiohttp in Python 3.12.

Updated requirements to take advantage of security fixes in dependent libraries.

* Minor improvements for library and snippets generators

Fix for #229. Thank you @ollipa for reporting this.

Updating async readme for #226.

Linting update (Black)

Co-authored-by: GitHub Action <support@meraki.com>

New example script for IPAM.

Minimum Python version bumped from 3.7 to 3.8 in setup.py, so subsequent versions of the generated package properly reflect the requirement.

Co-authored-by: GitHub Action <support@meraki.com>

Fixes #231

Co-authored-by: GitHub Action <support@meraki.com>

Addresses CVE-2023-49081.

Unblocks dependabot updates.

Co-authored-by: GitHub Action <support@meraki.com>