Add zone option JSON files for BIND9 grammar

- Created primary.zoneopt.json to define grammar for primary zones with various options including allow-query, allow-transfer, and DNSSEC settings.
- Added redirect.zoneopt.json for redirect zones, specifying options like allow-query and primaries.
- Introduced secondary.zoneopt.json for secondary zones, detailing options such as allow-notify, forwarders, and notify configurations.
- Implemented static-stub.zoneopt.json for static stub zones, including server-addresses and server-names options.
- Added stub.zoneopt.json for stub zones, defining options like check-names and forwarders.
- Created zoneopt.json as a general template for zone options, incorporating common fields across different zone types.

bind9-grammar/forward.zoneopt.json

@@ -0,0 +1,19 @@
+{
+    "zone": {
+        "_id": "<string> [ <class> ]",
+        "_mapbody": {
+            "type": {
+                "_grammar": "forward"
+            },
+            "forward": {
+                "_grammar": "( first | only )"
+            },
+            "forwarders": {
+                "_grammar": "[ port <integer> ] [ tls <string> ] { ( <ipv4_address> | <ipv6_address> ) [ port <integer> ] [ tls <string> ]; ... }"
+            },
+            "template": {
+                "_grammar": "<string>"
+            }
+        }
+    }
+}