azurerm: support load balancers

[colemickens]

providers/azurerm: support load balancers

Proposed: support Load Balancers on Azure by introducing a new resource azurerm_load_balancer. It looks like the azurerm_network_interface already supports being placed in the backend pool of a load balancer, and there's already support for azurerm_public_ip to provide as frontend ip configurations to the load balancer.

[jen20]

Hi @colemickens! This is being worked on in #6467, #6429 and (originally) #4343. Unfortunately "add support for" is a rather large job as the API is rather complex. Given that there are open pull requests for review, I'm going to close this issue in favour of discussion continuing on the relevant pull requests.

[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.

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