Resolve "Students should be able to type question"

Add a question text box the the enqueue form. Display the question in the Request view.

The question is stored as a clob or text type in h2.

It requires testing whether this works for mysql and if the hibernate validation agrees with the type liquibase chooses there.

Currently students are allowed to leave the question empty should it become a mandatory field?

UI:

Closes #197 (closed)