Integrate new media library APIs

[imagekitio]

New APIs have been added to manage files & folders in the ImageKit Media library.

The SDK should have wrapper functions and test case for the following APIs:

• Getting image metadata using URL for an image file. Change the existing function to accept both fileId and remote URL. If the value is a URL, internally call the right API endpoint.
• Bulk add or remove tags.
• Copy or move files.
• Copy or move folder.
• Get bulk job status for copy and move folder jobs.
• Create folder and Delete folder

Checklist before submitting PR

• All methods implemented
• Readme.md changes
• Examples added in sample project sample/index.js
• Test cases added for all new methods

[luisgregson]

I'd like to be assigned this issue if possible?

[imagekitio]

Shipped in version 3.1.2