feat: add DNS record resource and datasources (#25)

* add DNS record

* revamp tests

* lint

* cleanup

* feat dns test

* chore: add DNS Record tests

* linting

* f

examples/resources/unifi_dns_record/resource.tf

@@ -0,0 +1,11 @@
+resource "unifi_dns_record" "a_record" {
+    name   = "example.mydomain.com"
+    type   = "A"
+    record = "192.168.1.190"
+}
+
+resource "unifi_dns_record" "cname_record" {
+    name   = "example.mydomain.com"
+    type   = "CNAME"
+    record = "example.com"
+}