add env.get to function node defs

packages/node_modules/@node-red/editor-client/src/types/node-red/func.d.ts

@@ -102,3 +102,7 @@ declare class global {
     /** Get an array of the keys in the global context store */
     static keys(store?:string):Array<string> ;
 }
+declare class env {
+    /** Get an environment variable value */
+    static get(name:string);
+}