函数 read_varint_array 

fn read_varint_array(buf: [u8; 10]) -> Option<(u64, usize)>

基于

• https://github.com/tokio-rs/prost/blob/master/prost/src/encoding/varint.rs#L71
• https://github.com/google/protobuf/blob/3.3.x/src/google/protobuf/io/coded_stream.cc#L365-L406
• https://github.com/protocolbuffers/protobuf-go/blob/v1.27.1/encoding/protowire/wire.go#L358