Add missing types for aliases querystring.encode and querystring.decode to v12 & v11 (#35694)

* Added definitions - encode & decode aliases

These have existed since @ least v10 and are documented here: https://nodejs.org/api/querystring.html

* corrected order of comments for encode & decode

* Added definitions for encode & decode aliases

These have existed since at least v10 and are documented here:  https://nodejs.org/api/querystring.html

* corrected 'ParsedUrlQueryInput' & jsdoc comments

* Corrected jsdoc alignment

* Corrected jsdoc comment

* refactored encode and decode aliases with typeof

types/node/querystring.d.ts

@@ -12,13 +12,21 @@ declare module "querystring" {
 
     interface ParsedUrlQueryInput {
         [key: string]:
-            // The value type here is a "poor man's `unknown`". When these types support TypeScript
-            // 3.0+, we can replace this with `unknown`.
-            {} | null | undefined;
+        // The value type here is a "poor man's `unknown`". When these types support TypeScript
+        // 3.0+, we can replace this with `unknown`.
+        {} | null | undefined;
     }
 
     function stringify(obj?: ParsedUrlQueryInput, sep?: string, eq?: string, options?: StringifyOptions): string;
     function parse(str: string, sep?: string, eq?: string, options?: ParseOptions): ParsedUrlQuery;
+    /**
+     * The querystring.encode() function is an alias for querystring.stringify().
+     */
+    const encode: typeof stringify;
+    /**
+     * The querystring.decode() function is an alias for querystring.parse().
+     */
+    const decode: typeof parse;
     function escape(str: string): string;
     function unescape(str: string): string;
 }

types/node/v11/querystring.d.ts

@@ -12,13 +12,21 @@ declare module "querystring" {
 
     interface ParsedUrlQueryInput {
         [key: string]:
-            // The value type here is a "poor man's `unknown`". When these types support TypeScript
-            // 3.0+, we can replace this with `unknown`.
-            {} | null | undefined;
+        // The value type here is a "poor man's `unknown`". When these types support TypeScript
+        // 3.0+, we can replace this with `unknown`.
+        {} | null | undefined;
     }
 
     function stringify(obj?: ParsedUrlQueryInput, sep?: string, eq?: string, options?: StringifyOptions): string;
     function parse(str: string, sep?: string, eq?: string, options?: ParseOptions): ParsedUrlQuery;
+    /**
+     * The querystring.encode() function is an alias for querystring.stringify().
+     */
+    const encode: typeof stringify;
+    /**
+     * The querystring.decode() function is an alias for querystring.parse().
+     */
+    const decode: typeof parse;
     function escape(str: string): string;
     function unescape(str: string): string;
 }