Shortcut to save the current item to register without edit the file.

[woshichuanqilz]

Is your feature request related to a problem? Please describe.
Sometimes we need save the telescope to find a target file but wont edit it immediately. Just save the result to register or variable in lua. And we can use the target file name later.

Describe the solution you'd like
Provide a function which can return the target file name string or save the target file name in register.

Describe alternatives you've considered
None

Additional context
None