chore(resolver): export structs instead of interfaces

internal/provider/common/updater.go

@@ -1,5 +1,14 @@
 package common
 
-import "errors"
+import (
+	"context"
+	"errors"
+	"net"
+)
 
 var ErrNotEnoughServers = errors.New("not enough servers found")
+
+type ParallelResolver interface {
+	Resolve(ctx context.Context, hosts []string, minToFind int) (
+		hostToIPs map[string][]net.IP, warnings []string, err error)
+}