Move file icons, LS_COLORS related code from `grid` / `table` to a dedicated command

[blindFS]

Basics

• I have done a basic search through the issue tracker to find similar or related issues.
• I have made myself familiar with the available features of Nushell for the particular area this enhancement request touches.

Related problem

For file path rendering ls | grid --icons --color/ ls | table --icons, grid/table have special handling for "file path like" inputs.

I feel it really odd to implement it in current way.

The flag --icons is simply meaningless for most of the cases.

Describe the solution you'd like

#17248 (comment)

Describe alternatives you've considered

A icon metadata protocol for general icon rendering.

Additional context and details

No response