[Task] Highlighting #82

Highlighting a given source code is a task format we have evaluated in the past. There is already an implementation for the old OpenPatch system. https://gitlab.com/openpatch/web-frontend/-/tree/master/formats/highlight. It uses draft.js and also supports keyboard interaction for highlighting.

The easiest way would be to copy most of the stuff and use draftjs as well. Unfortunately, draftjs was not updated since August 2020 and the issue count is rising. Thus, I do not know if it is future-proof. Maybe someone knows a better alternative system.

Additional links:

• Old OpenPatch Version: https://openpatch.gitlab.io/web-frontend/?path=/story/format-highlight-renderer--with-dispatch
• Research Paper about automatically evaluating this task format: https://dl.acm.org/doi/10.1145/3279720.3279729
• Research Paper about using this task format: https://dl.acm.org/doi/10.1145/3304221.3319745