support install ecli as a systemd service or as a block device

[yunwei37]

• 目前它的应用可以是类似于一个 client/server 的模式，我们可以把它变成一个 systemd 的服务运行，类似于 bpfd，但是更轻量级；
• 可以使用了类似于 block device 的方式获取返回值；
  For example：

ecli systemd install
ecli systemd uninstall

use rpc to communicate with the block device
user don't need to worry about control
start with gRPC?
for control pannel