node-forge: add types for pkcs7 (#29374)

* add types for pkcs7

* bump version number

* revert change of node-forge version number

* mark content/contentInfo as optional and add arg for sign(options?)

types/node-forge/index.d.ts

@@ -5,6 +5,7 @@
 //                 Aakash Goenka <https://github.com/a-k-g>
 //                 Rafal2228 <https://github.com/rafal2228>
 //                 Beeno Tung <https://github.com/beenotung>
+//                 Joe Flateau <https://github.com/joeflateau>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.6
 
@@ -410,6 +411,26 @@ declare module "node-forge" {
         function pkcs12FromAsn1(obj: any, strict?: boolean, password?: string): Pkcs12Pfx;
         function pkcs12FromAsn1(obj: any, password?: string): Pkcs12Pfx;
     }
+    namespace pkcs7 {
+        interface PkcsSignedData {
+            content?: string | util.ByteBuffer;
+            contentInfo?: { value: any[] };
+  
+            addCertificate(certificate: pki.Certificate): void;
+            addSigner(options: {
+                key: string;
+                certificate: pki.Certificate;
+                digestAlgorithm: string;
+                authenticatedAttributes: { type: string; value?: string }[];
+            }): void;
+            sign(options?:{
+                detached?: boolean
+            }): void;
+            toAsn1(): asn1.Asn1;
+        }
+  
+        function createSignedData(): PkcsSignedData;
+    }
 
     namespace md {