Migrate contentjson and badjson to library &

Add omitempty in format

option/tls_acme.go

@@ -1,9 +1,9 @@
 package option
 
 import (
-	"github.com/sagernet/sing-box/common/json"
 	C "github.com/sagernet/sing-box/constant"
 	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/json"
 )
 
 type InboundACMEOptions struct {
@@ -62,7 +62,7 @@ func (o *ACMEDNS01ChallengeOptions) UnmarshalJSON(bytes []byte) error {
 	}
 	err = UnmarshallExcluded(bytes, (*_ACMEDNS01ChallengeOptions)(o), v)
 	if err != nil {
-		return E.Cause(err, "DNS01 challenge options")
+		return err
 	}
 	return nil
 }