[RFC]: add `fs/stat`

[Daniel777y]

Description

This RFC proposes adding the package @stdlib/fs/stat for inspecting details of files asynchronously and synchronously.

var stat = require( '@stdlib/fs/stat' );
var statSync = require( '@stdlib/fs/stat' ).sync;

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Checklist

• [X] I have read and understood the Code of Conduct.
• [X] Searched for existing issues and pull requests.
• [X] The issue name begins with RFC:.

[Daniel777y]

Hi, @kgryte . I found this can be used by other packages in @stdlib/fs. Can I try working on this?