Add feature "connection_string"

[yoshi-qc]

Description

Add Azure Quantum connection_string.
https://learn.microsoft.com/en-us/azure/quantum/how-to-connect-workspace?tabs=tabid-python1%2Ctabid-python

In this PR, the options connection_string and use_string are added on AzureBackend in azure.py and AzureConfig in config.py.

• Set connection_string on Azure quantum.

connection_string = "your_connection_string"
set_azure_config(connection_string= connection_string, use_string = True)

After seting as above, the quantum computing using TKET's manners, AzureBackend.available_devices(), AzureBackend('quantinuum.sim.h1-1e'), etc., works.

Checklist

• I have performed a self-review of my code.
• I have commented hard-to-understand parts of my code.
• I have made corresponding changes to the public API documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the changelog with any user-facing changes.

[yoshi-qc]

We can access to Azure Quantum without a popup window as below. I have confirmed that AzureQuantum can be accessed from a docker container. I hope this helps for Nexus.

from pytket.extensions.azure import AzureBackend, AzureConfig, set_azure_config
connection_string = "your_connection_string"
set_azure_config(connection_string= connection_string, use_string = True)
AzureBackend.available_devices()