adding flask limiter to all endpoints

api/__init__.py

api/endpoints/findsalamanderinfo.py

api/endpoints/location.py

api/endpoints/login.py

api/endpoints/manageuser.py

api/endpoints/matchsalamander.py

api/endpoints/pendingusers.py

api/endpoints/salamanderclass.py

api/endpoints/user.py

api/endpoints/verifypassword.py