JacksonGenerator serializes byte[] as array of numbers

Is this the preferred behavior?

As far as I know Jackson by default encodes `byte[]` to Base64 strings, why this change? In there any point where the array of numbers representation is useful?

I am asking because this behavior forces users to do the base64 encoding by themselves when loading [BYTES](https://cloud.google.com/bigquery/data-types) data into a BigQuery table using [`TableDataInsertAllRequest`](https://developers.google.com/resources/api-libraries/documentation/bigquery/v2/java/latest/com/google/api/services/bigquery/model/TableDataInsertAllRequest.html).

首先找到 JacksonGenerator，並檢查 byte[] 值的序列化方式。將其輸出與連結的 BigQuery BYTES 文件以及 TableDataInsertAllRequest 的使用方式進行比較。當預期的表示方式取得共識，並透過一項針對性的回歸測試驗證後，即表示完成。

由索引模型根據 Issue 內容生成。