Add GlideJsonPath Example to Core ServiceNow APIs (#1828)

* add GlideJsonPath Example

* move to subcategory

* formatting reference list

Author: ewatch

Core ServiceNow APIs/GlideJsonPath/Basic-Example/README.md

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+# Querying JSON with JSONPath to extract values
+
+GlideJsonPath is a class which can be used to use JSONPath in ServiceNow. It can be useful when working with JSON Payloads, especially highly nested or in general complex structures.
+
+References:
+- [RFC 9535: JSONPath: Query Expressions for JSON](https://datatracker.ietf.org/doc/rfc9535/)
+- [Play with JSONPath outside of ServiceNow](https://jsonpath.com/)
+- [Good Examples to start with](https://restfulapi.net/json-jsonpath/)
+- [ServiceNow API Documentation](https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/GlideJsonPath/concept/GlideJsonPathAPI.html)

Core ServiceNow APIs/GlideJsonPath/Basic-Example/examples.js

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+// Run in background script
+var json = { 
+	"store": 
+	{
+		"book": [
+			{ 
+				"category": "reference",
+				"author": "Nigel Rees",
+				"title": "Sayings of the Century",
+				"price": 8.95
+			},
+			{ 
+				"category": "fiction",
+				"author": "Evelyn Waugh",
+				"title": "Sword of Honour",
+				"price": 12.99
+			},
+			{ 
+				"category": "fiction",
+				"author": "Herman Melville",
+				"title": "Moby Dick",
+				"isbn": "0-553-21311-3",
+				"price": 8.99
+			},
+			{ 
+				"category": "fiction",
+				"author": "J. R. R. Tolkien",
+				"title": "The Lord of the Rings",
+				"isbn": "0-395-19395-8",
+				"price": 22.99
+			}
+		],
+		"bicycle": {
+			"color": "red",
+			"price": 19.95
+		}
+	}
+};
+
+var path1 = 'store.book[0].author'; // The author of the first book
+var path2 = 'store.book[*].author'; // All authors
+var path3 = 'store..price'; // All prices
+var path4 = '$..book[?(@.price<10)]'; // All books cheaper than 10
+var path5 = '$..book[?(@.isbn)]'; // All books with an ISBN number
+var path6 = '$..*'; // All members of JSON structure
+
+var gjp = new GlideJsonPath(JSON.stringify(json));
+gs.info('Path: ' + path1 + ' Result: ' + gjp.read(path1));
+gs.info('Path: ' + path2 + ' Result: ' + gjp.read(path2));
+gs.info('Path: ' + path3 + ' Result: ' + gjp.read(path3));
+gs.info('Path: ' + path4 + ' Result: ' + gjp.read(path4));
+gs.info('Path: ' + path5 + ' Result: ' + gjp.read(path5));
+gs.info('Path: ' + path6 + ' Result: ' + gjp.read(path6));