[bug] dependency `uamqp` needs to be replaced with pure Python AMQP package

[stefanb2]

Describe the bug
uamqp is no longer maintained and will be deprecated soon(?). Therefore Azure CLI IoT extension can't be used with Python 3.14+.

To Reproduce
Steps to reproduce the behavior:

1. create a Python virtual environment on a system with Python 3.14+
2. pip3 install azure-cli
3. az extension install -n azure-iot --allow-preview True
4. az iot hub monitor-events --subscription <subscription> --hub-name <hub>

$ az iot hub monitor-events --subscription ...
Dependency update (uamqp 1.6.6) required for IoT extension version: 0.30.0b1. 
Continue? (y/n) -> y
Updating required dependency...
Failure updating uamqp. Aborting...
... long list of error messages boiling down to the fact that uamqp doesn't compile against Python 3.14+ ...

Expected behavior
Azure CLI with IoT extension can be used together with Python 3.14+.

Environment (please complete the following information):

• OS: Fedora 43
• Shell: bash
• Az CLI version: 2.80.0
• IoT extension version: 0.30.0b1
• Python version (if pip installed): 3.14

Additional context
If I understand this PR correctly other Azure Python projects have moved to a pure Python AMQP package.

[digimaun]

@stefanb2, thanks for creating this issue. We're investigating and planning next steps for the uamqp replacement.