Updating swagger

[ashleynhs]

Overview

Updating swagger docs post user session/fcm/auth refactor.

Changes Made

• All user IDs are using firebaseUid instead of userId
• All ID fields in schemas are using type: 'string' without UUID format where they refer to firebaseUid
• All endpoint parameters that accept firebaseUid are properly typed as strings
• Authentication is consistently handled through bearer tokens
• added the four new endpoints

Next Steps (delete if not applicable)

NOTE: This branch was made from refactoring user sessions branch.

[Aayush-Agnihotri]

lgtm