Create a component for submitting images to the backend

[rj-calvin]

We need to introduce two new form components to our library, FormFileInput and ImageTransform.

FormFileInput will be our React abstraction for <input type="file" /> elements that allow users to select a file from their filesystem for submitting to our backend. Likewise, ImageTransform will be a component that allows an image supplied as a prop to be manipulated/cropped.

Both components should leave most of their interface abstract, making it the responsibility of the caller to handle state involving the files themselves. The caller will supply a callback method to be fired on the onChange event of FormFileInput so that the selected file can be stored in a stateful variable. This update to state can then be used to chain the file into ImageTransform where the cropped image can be stored in a second state variable that can be used when a custom onSubmit callback is fired.