[Feature]: Add edezone parameter to create azure firewall cmdlet

### Description of the new feature

Azure firewalls can be now be created in extended locations. We want to add a new parameter for create az firewall called -EdgeZone. Similar work was done for creation of VnetGateway.

https://github.com/Azure/azure-powershell/commit/76c8995ba80e5976d421003be1922490e0de1261#diff-9606f2b8dedf7c8abac43163cdf9762d40cf1f1e4f25229a07e76180a71494df

### Proposed implementation details (optional)

New-AzFirewall -Name
-ResourceGroupName
-Location
-VirtualNetwork
-PublicIpAddress
**-EdgeZone **

⚠️ Mutual Exclusivity:

When -EdgeZone is specified, you CANNOT use -Zone (availability zones)
Edge zone deployments do not support availability zones
Attempting to use both will throw an [ArgumentException]

✅ Prerequisites:

Virtual Network must be created in the edge zone
Public IP Address must be created in the same edge zone
Location must support the edge zone (e.g., eastus2euap for microsoftrrezm1)