Build a benchmark to compare performance

[Leeeon233]

candidate：

• columnar
• postcard
• bincode

[Leeeon233]

For Test Data

#[columnar(vec)]
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct Data {
    #[columnar(strategy = "DeltaRle", original_type = "u64")]
    id: u64,
    name: String,
}

#[columnar]
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct VecStore {
    #[columnar(type = "vec")]
    pub data: Vec<Data>,
}

let mut _data = Vec::new();
for i in 0..10000 {
    _data.push(Data {
        id: i / 50,
        name: format!("name{}", i),
    });
}
VecStore { data: _data }

	encode size (kb)	encode time (µs)
columnar	87	1057.1
postcard	100	824.9
bincode	194	793.30