rename prommetric to prometheous, add unit tests

zrpc/internal/serverinterceptors/prometheousinterceptor.go

@@ -32,7 +32,7 @@ var (
 	})
 )
 
-func UnaryPromMetricInterceptor() grpc.UnaryServerInterceptor {
+func UnaryPrometheousInterceptor() grpc.UnaryServerInterceptor {
 	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (
 		interface{}, error) {
 		startTime := timex.Now()

zrpc/internal/serverinterceptors/prometheousinterceptor_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestUnaryPromMetricInterceptor(t *testing.T) {
-	interceptor := UnaryPromMetricInterceptor()
+	interceptor := UnaryPrometheousInterceptor()
 	_, err := interceptor(context.Background(), nil, &grpc.UnaryServerInfo{
 		FullMethod: "/",
 	}, func(ctx context.Context, req interface{}) (interface{}, error) {