How about 'docker cp' support to copy a file into the host environment?

**Is your feature request related to a problem? Please describe.**
It would be amazing to have support to quickly copy a file for checking some output files.

**Describe the solution you'd like**
A command like `E` which opens a prompt where a full path is entered. It would be best if previous paths would also be remembered. On confirming, the file is pulled and saved to the current directory `lazydocker` was started.

**Describe alternatives you've considered**
Well, one could always manually use `docker cp :/file/path/within/container /host/path/target`.

Or maybe via the `lazydocker` custom commands? Although, I haven't tested those yet, not sure if that is supported.