feat: new --args parameter for fd an rg search

[LatentDream]

Please describe the problem you're trying to solve

With the new --args parameter, users can pass custom arguments to fd or rg, for example, search fd --args='-e -H'.

Related issue: Closes #962

Would you be willing to contribute this feature?

• Yes, I'll give it a shot

Describe the solution

Parse the --args string into an array using the shell-words crate.

• rebuilt the input without the --args parameter
• pass the args to the rg and fd commands

Additional context

• Tested on Windows and MacOS

[sxyazi]

Thank you for contributing to this feature!