Check if Object Is Empty

Implement isEmptyObject(value), which returns true if value is an object with no own enumerable string keys, and false otherwise.

• {} and Object.create(null) are empty.
• An object whose only properties are inherited from its prototype is empty.
• [] is an object with no keys, so it is empty; [1] is not.
• null, undefined, numbers, strings, booleans: return false (they are not objects).
• A property whose value is undefined still counts as a key.