Implement Title Request API View for Front-End and wire into frontend

[nikolajbaer]

When a user sees a title they would like to borrow, they click the "Request" Title button. This needs to result in a new TitleRequest object being created on the backend through the request-title api endpoint.

This API endpoint is currently stubbed out but needs to be implemented, as well as a corresponding backend Call in the react.js frontend. This should all be plugged into the button click on that page with the relevant Title's Id (user auth will be managed).

Possible error states should also be considered, such as Title no longer being valid or user being disabled / not allowed to borrow. A simple Alert or error message would suffice.