fix: we need to define custom array encoding and decoding api due to non-standard message packing in the dart implementation

utils/array.go

@@ -0,0 +1,62 @@
+package utils
+
+import (
+	"errors"
+	"github.com/vmihailenco/msgpack/v5"
+	"net/url"
+)
+
+func EncodeMsgpackArray(enc *msgpack.Encoder, array interface{}) error {
+	switch v := array.(type) {
+	case []*url.URL:
+		// Handle []*url.URL slice
+		err := enc.EncodeInt(int64(len(v)))
+		if err != nil {
+			return err
+		}
+		for _, item := range v {
+			err = enc.Encode(item)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	default:
+		// Handle generic case
+		arr, ok := array.([]interface{})
+		if !ok {
+			return errors.New("unsupported type for EncodeMsgpackArray")
+		}
+		err := enc.EncodeInt(int64(len(arr)))
+		if err != nil {
+			return err
+		}
+		for _, item := range arr {
+			err = enc.Encode(item)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+}
+
+func DecodeMsgpackArray(dec *msgpack.Decoder) ([]interface{}, error) {
+	arrayLen, err := dec.DecodeInt()
+	if err != nil {
+		return nil, err
+	}
+
+	array := make([]interface{}, arrayLen)
+
+	for i := 0; i < int(arrayLen); i++ {
+		item, err := dec.DecodeInterface()
+		if err != nil {
+			return nil, err
+		}
+
+		array[i] = item
+	}
+
+	return array, nil
+}