feat: update Object.fromEntries types

Added an optional generic type with PropertyKey as the default type for the object argument in Object.fromEntries. This makes the typing of this function “end-to-end”. For example, if [ “value1” | “value2”, string ][] is passed as an argument, the output value will be { [Key in “value1” | “value2”]: string }

src/lib/es2019.object.d.ts

@@ -5,7 +5,7 @@ interface ObjectConstructor {
      * Returns an object created by key-value entries for properties and methods
      * @param entries An iterable object that contains key-value entries for properties and methods.
      */
-    fromEntries<T = any>(entries: Iterable<readonly [PropertyKey, T]>): { [k: string]: T; };
+    fromEntries<T = any, K extends PropertyKey = PropertyKey>(entries: Iterable<readonly [K, T]>): { [Key in K]: T; };
 
     /**
      * Returns an object created by key-value entries for properties and methods