Add P2S VPN Support to Module on VPN Gateways

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### Description
From the documentation and code I see that only "azurerm_vpn_gateway" resource is being deployed when I enable
vpn_gateway = {
**enabled = true**

vwan_hub_networks = [
{
enabled = false
config = {
address_prefix = "10.200.0.0/22"
location = ""
sku = ""
routes = []
expressroute_gateway = {
enabled = false
config = {
scale_unit = 1
}
}
**vpn_gateway = {
enabled = true**
config = {
bgp_settings = []
routing_preference = ""
scale_unit = 1
}
}

But This resource is only to enable site to site connection. But My requirement is to create a point to site VPN with AAD authentication.

I would like to know if creating a P2S using AAD is possible For VWAN

#### Is your feature request related to a problem?
Yes

#### Describe the solution you'd like
NA

#### Additional context

Start with the module entry point that processes the vpn_gateway configuration and the azurerm_vpn_gateway resource described in the issue. Verify whether Azure VWAN supports point-to-site VPN with Azure AD authentication, then determine the required configuration and acceptance criteria before changing the module. Done means the supported configuration is implemented and documented with validation for the requested scenario.

Written by the indexing model from the issue text.