Cli supports zset data structures (#249)

[halalala222]

1. prevent repeated creation of grpc connections and various command clients to avoid goroutine leaks and reduce the number of goroutines created.

before pr :

use go pprof tools

flyDB client start

run put test test 11 times

after run put test test 11 times

cause by :

The specified call for each gRPC client will create a gRPC connection using grpc.Dial. However, after the call is executed, the connection will not be closed.

example : string put

// newGrpcClient returns a grpc client
func newGrpcClient(addr string) (gstring.GStringServiceClient, error) {
    conn, err := grpc.Dial(addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
    if err != nil {
       return nil, err
    }
    client := gstring.NewGStringServiceClient(conn)
    return client, nil
}

// Put puts a key-value pair into the db by client api
func (c *Client) Put(key string, value interface{}) error {
    client, err := newGrpcClient(c.Addr)
    if err != nil {
        return errors.New("new grpc client error: " + err.Error())
    }
    //...
    return nil
}

after pr :

flyDB client start

run put test test 17 times

after run put test test 17 times

2. cli support zset

note : for ZAdds , Grumble does not support having multiple lists within multiple args,because no args can follow a list. Therefore, it is not possible to implement this functionality.

[qishenonly]

Thank you very much for solving potential security vulnerabilities in FlyDB. After we check that your code is correct, we will merge your pr into the main branch tomorrow.