Added TokenCodes and Endpoints for redeeming and requesting

src/app.module.ts

src/auth/agent-auth.guard.ts

src/auth/graphql-auth.guard.ts

src/main.ts

src/resolvers/agent.resolver.ts

src/resolvers/entry.resolver.ts

src/resolvers/group.resolver.ts

src/resolvers/models/agent.model.ts

src/resolvers/models/tokenCode.model.ts

src/resolvers/resolver.module.ts

src/resolvers/tokenCode.resolver.ts