Doris Stream Load in Rust

How to use:

Create a table in Doris:

CREATE TABLE `db0`.`t_user` (
    `id` int,
    `name` string
)
DUPLICATE KEY(`id`)
DISTRIBUTED BY HASH(`id`) BUCKETS 1
PROPERTIES (
    "replication_num" = "1"
);

Build the project:
```
cargo build
```
Run the application:
```
cargo run
```

What can this demo do:

This is a rust demo for doris stream load, you can use this code load your data into doris by stream load.