adding unix permissions columnn

[gavasc]

No description provided.

[aristotelesbr]

Hey @gavasc tks for contributing the permissions display feature! It's a great addition, but I have a few concerns about including it in the default layout:

Cross-platform compatibility: Unix permissions don't translate well to Windows systems and might not work correctly there.
User preference: Not everyone needs to see permissions by default.

I suggest we keep this functionality as:

Available in AVAILABLE_COLUMNS (as already implemented)
Not included in DEFAULT_COLUMNS. Accessible through a more flexible configuration system

We could implement:

• A .lsdrc config file where users can set their column preferences

# .lsdrc - yml or toml

columns:
  - index
  - name
  - type
  - size
  - permissions # customize layout
  - modified    # other options

style:
  border: unicode
  rounded_corners: true
  
sort:
  by: name
  reverse: false

format:
  date: relative    # relative, iso, etc.
  size: human       # human, bytes, etc.

colors:
  name: cyan
  size: green
  modified: magenta

• Environment variables like LSD_COLUMNS for temporary customization
• An extensible system where users can add/remove columns as needed

This would make the tool more flexible without changing the default experience. What do you think?