Add examples for port profile

examples/data-sources/unifi_port_profile/data-source.tf

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+data "unifi_port_profile" "all" {
+}

examples/resources/unifi_port_profile/resource.tf

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+variable "vlan_id" {
+  default = 10
+}
+
+resource "unifi_network" "vlan" {
+  name    = "wifi-vlan"
+  purpose = "corporate"
+
+  subnet       = "10.0.0.1/24"
+  vlan_id      = var.vlan_id
+  dhcp_start   = "10.0.0.6"
+  dhcp_stop    = "10.0.0.254"
+  dhcp_enabled = true
+}
+
+resource "unifi_port_profile" "poe_disabled" {
+  name = "POE Disabled"
+
+  native_networkconf_id = unifi_network.vlan.id
+  poe_mode              = "off"
+}