azurerm_public_ip support for IPv6

[tombuildsstuff]

Currently azurerm_public_ip only supports IPv4 but IPv6 is available in the API and SDK - as such it'd be good to add to the resource once #245 is merged

[tombuildsstuff]

Took a look into this, appears this is blocked on the Virtual Network not supporting IPv6 CIDR's at the moment. I've opened this issue to investigate further: Azure/azure-rest-api-specs#1556

[tombuildsstuff]

From what I can ascertain, I don't think this is going to be possible anytime soon - as such I'm going to close this issue for the moment - however we'll be sure to take another look into this when it's available.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!