feat: Switch to the official protobuf-parse.

[liuxin231]

Motivation

Switch to the official protobuf-parse.

#3

[PureWhiteWu]

Hi, thanks very much for your contribution!

We have some other improvements and bug fixes in our version, you may refer to the commits: https://github.com/LYF1999/rust-protobuf/commits/protobuf2/

Maybe we should submit them to the official protobuf-parse repo, and then we can switch the official one.

[liuxin231]

@PureWhiteWu 了解，我修改后执行测试方法没有问题就给提交了，应该先问一下，我先关闭这个提交。

[PureWhiteWu]

@liuxin231 感谢你的贡献，是我们这边 issue 没有及时更新，后续也没有精力再去提 PR 给上游跟进了。
看起来现在上游重新开始维护了，那我们后续可以把我们的改动先提交一下。