VPN Gateway P2S support

[juang903]

Overview/Summary

Adds support for configuring P2S connections in the VPN gateway

This PR fixes/adds/changes/removes

1. Adds the option to configure P2S VPN connections

Testing Evidence

Tested by deploying config for AAD, Certificate, and Radius authentication.

[juang903]

I have some sample parameters that I would like to add, but not sure where this is best documented. Please advise.
The sample parameters are for vpnClientConfiguration in hubNetworking.parameters.all.json. Here is an example for AAD auth...
"vpnClientConfiguration": { "vpnClientAddressPool": { "addressPrefixes": [ "172.16.0.0/24" ] }, "vpnClientProtocols": [ "OpenVPN" ], "vpnAuthenticationTypes": [ "AAD" ], "aadTenant": "https://login.microsoftonline.com/**My-Tenant-ID**", "aadAudience": "41b23e61-6c1e-4545-b367-cd054e0ed4b4", "aadIssuer": "https://sts.windows.net/**My-Tenant-ID**/" }

[jtracey93]

@juang903 consider adding them to the readme in the parameters section like we did for management groups: https://github.com/Azure/ALZ-Bicep/tree/main/infra-as-code/bicep/modules/managementGroups#parameters

[microsoft-github-policy-service]

This pull request has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 7 days. It will be closed if no further activity occurs within 7 days of this comment.

[juang903]

@jtracey93 Thanks. I added an example of how to set this config in the readme.

[oZakari]

Fixed some minor linting issues, but everything else looks good to me! Thank you for your contribution, @juang903!