Cli supports commands ignoring case

[Uncle-Justice]

uj001@uj001:~/flydb$ ./bin/flydb-client 127.0.0.1:8999

              ______    __             ____     ____ 
             / ____/   / /   __  __   / __ \   / __ )
            / /       / /   / / / /  / / / /  / /_/ /
           / /_      / /   / / / /  / / / /  / __ |
          / __/     / /   / /_/ /  / / / /  / / / / 
         / /       / /    \__, /  / /_/ /  / /_/ /  
        /_/       /_/    ,__/ /  /_____/  /_____/  
                        /____/                                              

flydb $> LPush l1 1
LPush data success
flydb $> lpush l1 1
error: unknown command, try 'help'

[qishenonly]

At present, FlyDB-Cli exclusively supports uppercase commands and does not handle operations that are case-insensitive.