[BUG] Analysis Services IPv4 rule name casing issue fix

[r0bnet]

I needed to change the hash function of an ipv4_firewall_rule to a custom one in order to prevent situations like the following:

azurerm_analysis_services_server.analysis_services will be updated in-place
  ~ resource "azurerm_analysis_services_server" "analysis_services" {
        admin_users               = []
        enable_power_bi_service   = true
        id                        = "/subscriptions/dc8fbfc0-2769-421c-921e-f0dae437fa79/resourceGroups/dl4-analysis-services-rg/providers/Microsoft.AnalysisServices/servers/myanalysisservices"
        location                  = "northeurope"
        name                      = "myanalysisservices"
        querypool_connection_mode = "All"
        resource_group_name       = "dl4-analysis-services-rg"
        server_full_name          = "asazure://northeurope.asazure.windows.net/myanalysisservices"
        sku                       = "S1"
        tags                      = {}
      + ipv4_firewall_rule {
          + name        = "DWHMGMT-QDM-VM"
          + range_end   = "13.74.177.213"
          + range_start = "13.74.177.213"
        }
      - ipv4_firewall_rule {
          - name        = "dwhmgmt-qdm-vm" -> null
          - range_end   = "13.74.177.213" -> null
          - range_start = "13.74.177.213" -> null
        }
    }

When applying the changes above nothing really changed on server side as it didn't see a difference in the name.

@tombuildsstuff suggested to try to convert it to a list instead but I already switched the rules to Set a few weeks ago because the order sometimes randomly changed. That's why I think a Set is the best option here.

[jackofallops]

Thanks @r0bnet
LGTM 👍 Will fire off the acctests now.

Ste

[jackofallops]

Tests pass:

[ghost]

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