Implement resolve topic feature

Implements User story 4 #51 Resolves #45, #46, #47, #48, #49, #50 Summary

Added resolve button component and resolution status display on topic frontend
Added resolve field to Topic object
Edited user privileges so only topic owners, administrators, and moderators can resolve a topic
Added API endpoint for resolve topic
Set up backend event handling of resolve button clicks (event listeners)
Added controllers function to actually update the resolve field given appropriate permissions

Motivation I personally benefited a lot from the Piazza resolve functionality:

As a student, I can indicate to instructors that I need more help
As a TA, I can quickly see which students still need more help I believe adding this feature to NodeBB would make it more applicable as a Q&A forum for the classroom, since instructors and students alike will benefit from this feature with a more efficient process of asking questions and giving and receiving answers.

Changes made Did not edit or remove any existing functionalities Added new resolve functionality

Testing done Visual testing

created new topic, check that I can mark the new topic as resolved and resolve status is updated on topic page
created new topic, register for a new account, check that new account can not see the resolve button to resolve the topic, however new account can see resolve status
log in as administrator, check that welcome to NodeBB can be resolved and resolve status is updated on topic page Automated testing
check that a topic can be resolved with its owner's uid
check that a topic cannot be resolved with other uids

Checklist

Next steps

A good next implementation would be to add a filter in the General Discussion for resolved / unresolved topics

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/controllers/write/topics.js	6	9	66.67%
src/topics/tools.js	14	17	82.35%
<!--	Total:	23	29	79.31%	-->

CMU-313 / spring24-nodebb-apple