protobuf 编码之varint/zigzag

发现Avro为了对int、long类型数据压缩，采用Protocol Buffers的ZigZag编码Thrift也采用了类似的算法.

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参考:

https://izualzhy.cn/protobuf-encode-varint-and-zigzag
https://www.cnblogs.com/en-heng/p/5570609.html