[Enhancement]: Add interface service_policy parameter

[acch]

Adds ability to configure service_policy parameter of IP Interfaces.

Closes #306.

Acceptance tests pass:

$ TF_ACC=1 go test ./internal/provider/networking/network_ip_interface_resource_test.go -v
=== RUN   TestAccNetworkIpInterfaceResource
--- PASS: TestAccNetworkIpInterfaceResource (4.44s)
PASS
ok      command-line-arguments  4.449s

$ TF_ACC=1 go test ./internal/provider/networking/network_ip_interface_resource_alias_test.go -v
=== RUN   TestAccNetworkIpInterfaceResourceAlias
--- PASS: TestAccNetworkIpInterfaceResourceAlias (3.93s)
PASS
ok      command-line-arguments  3.935s

Example Terraform Configuration:

// sample IP Interface with service_policy parameter
resource "netapp-ontap_networking_ip_interface" "example" {
  cx_profile_name = ...
  name            = ...
  svm_name        = ...
  ...
  service_policy   = "default-management"
}