feat: support third party orm to interact with go-zero (#1286)

* fixes #987

* chore: fix test failure

* chore: add comments

* feat: support third party orm to interact with go-zero

* chore: refactor

zrpc/resolver/target.go

@@ -0,0 +1,20 @@
+package resolver
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/tal-tech/go-zero/zrpc/resolver/internal"
+)
+
+// BuildDirectTarget returns a string that represents the given endpoints with direct schema.
+func BuildDirectTarget(endpoints []string) string {
+	return fmt.Sprintf("%s:///%s", internal.DirectScheme,
+		strings.Join(endpoints, internal.EndpointSep))
+}
+
+// BuildDiscovTarget returns a string that represents the given endpoints with discov schema.
+func BuildDiscovTarget(endpoints []string, key string) string {
+	return fmt.Sprintf("%s://%s/%s", internal.DiscovScheme,
+		strings.Join(endpoints, internal.EndpointSep), key)
+}