NewRpcClient initializes all service clients with a shared gRPC connection.

StreamInterceptor returns a gRPC stream interceptor that adds the authorization token to each stream request, except for the methods listed in publicMethods.

UnaryInterceptor returns a gRPC interceptor that adds the authorization token to each request, except for the methods listed in AuthMethods.

AuthClient encapsulates the gRPC client and logger for authentication services.

ChatClient encapsulates the gRPC client for chat services.

FriendsClient encapsulates the gRPC client for friend services.

RpcClient manages multiple gRPC clients for different services.

TokenManager handles all operations related to managing tokens.

For testing.