Upgrade gRPC instrumentation for better telemetry

Replaced the gRPC server's UnaryInterceptor with StatsHandler from the otelgrpc package for enhanced monitoring capabilities, aligning with best practices for observability. This update allows us to take full advantage of OpenTelemetry's metrics and traces, thereby improving insight into our gRPC server's performance and reliability.

Signed-off-by: SammyOina <[email protected]>

internal/server/grpc/grpc.go

@@ -52,7 +52,7 @@ func New(ctx context.Context, cancel context.CancelFunc, name string, config ser
 func (s *Server) Start() error {
 	errCh := make(chan error)
 	grpcServerOptions := []grpc.ServerOption{
-		grpc.UnaryInterceptor(otelgrpc.UnaryServerInterceptor()),
+		grpc.StatsHandler(otelgrpc.NewServerHandler()),
 	}
 
 	listener, err := net.Listen("tcp", s.Address)