Add Terraform example for serverless egress control (FQDN allow list for outbound internet traffic)

[micheledaddetta-databricks]

Request to add a Terraform-based example that demonstrates how to configure serverless egress control in Databricks for outbound internet traffic using an FQDN allow list.

[elisabetao]

Following :databricks/terraform-provider-databricks#4538 and this documentation req is this TF https://registry.terraform.io/providers/databricks/databricks/latest/docs/resources/account_network_policy supported for Azure Databricks. Thanks in advance