refactor(api): restructure bolt package (#1981)

* refactor(api): bolt package refactor

* refactor(api): refactor bolt package

api/bolt/internal/internal.go

@@ -1,25 +0,0 @@
-package internal
-
-import (
-	"encoding/binary"
-	"encoding/json"
-)
-
-// MarshalObject encodes an object to binary format
-func MarshalObject(object interface{}) ([]byte, error) {
-	return json.Marshal(object)
-}
-
-// UnmarshalObject decodes an object from binary data
-func UnmarshalObject(data []byte, object interface{}) error {
-	return json.Unmarshal(data, object)
-}
-
-// Itob returns an 8-byte big endian representation of v.
-// This function is typically used for encoding integer IDs to byte slices
-// so that they can be used as BoltDB keys.
-func Itob(v int) []byte {
-	b := make([]byte, 8)
-	binary.BigEndian.PutUint64(b, uint64(v))
-	return b
-}