Implement Safety Measures for Dangerous Commands in `AiShell`

[code-yeongyu]

It would be great if the system could implement some safety measures for commands that could potentially cause harm, such as:

• handling git
• removing files permanently

The idea is that, before executing any dangerous command, AiShell could ask the user for confirmation. This way, accidental execution of harmful commands can be prevented.

[code-yeongyu]

considering now to ask everytime Y/N prompt to execute the command or not, because it's much easier way to implement.