feat: add sport challenge submissions with server side verificaiton

CTFd/api/v1/challenges.py

CTFd/api/v1/files.py

CTFd/challenges.py

CTFd/models/__init__.py

CTFd/plugins/challenges/__init__.py

CTFd/plugins/sport_challenges/__init__.py

CTFd/plugins/sport_challenges/assets/update.html

CTFd/themes/admin/static/assets/CommentBox.87ae6044.js

CTFd/themes/admin/static/assets/echarts.common.27787dd0.js

CTFd/themes/admin/static/assets/graphs.b7b78872.js

CTFd/themes/admin/static/assets/htmlmixed.3b26375a.js

CTFd/themes/admin/static/assets/pages/challenge.23743f93.js

CTFd/themes/admin/static/assets/pages/challenge.646b94e9.js

CTFd/themes/admin/static/assets/pages/challenges.3015604e.js

CTFd/themes/admin/static/assets/pages/configs.f0bad2d0.js

CTFd/themes/admin/static/assets/pages/editor.d6714303.js

CTFd/themes/admin/static/assets/pages/main.a9ca099a.js

...hemes/admin/static/assets/pages/notifications.614402a3.js

CTFd/themes/admin/static/assets/pages/pages.ad27ee97.js

CTFd/themes/admin/static/assets/pages/reset.ca414d37.js