Fix/version bump changes

[prasoon0909]

1. We've introduced an authenticator function. When you use this function, it gives you a promise that, when fulfilled, hands you an object. This object holds important security details like signature, token, and expire.
2. With the plugin's latest version, there's no need for the authenticationEndpoint parameter. We've removed it to make things easier and more streamlined.
3. imagekit-uppy-plugin version bump