feat(chat): update `MessageSerializer` to implement caching pattern for message groups
feat(chat): update `MessageSerializer` to implement caching pattern for message groups

cjlee112/socraticqs2,raccoongang/socraticqs2,cjlee112/socraticqs2,cjlee112/socraticqs2,raccoongang/socraticqs2,raccoongang/socraticqs2,cjlee112/socraticqs2,raccoongang/socraticqs2