Application answering page

[Plebbaroni]

• Functionality for answering applications, also added small features such as max roles per applicant, etc.

NOTES:

• Might need to add debouncing, performing actions in quick succession has undeterministic cooked behaviour.
• Next occasionally complains about the drag and drop components not having explicit drag handles for roleCards, as our entire component is supposed to be draggable and droppable(this doesn't affect functionality in my experience). Might want to explore ways to remedy this(assigning an explicit draggable/droppable element didn't fix it.)

Tested:

• Going from campaign details page -> apply -> finish page working and applications show up in the review applications page

Yet to test:

• Ensure other functionalities are intact from resolving merge conflicts