Summary of the new feature / enhancement

Similar to what we now have in C#, it would be great to introduce digit separators to PowerShell, so we can enter numbers in a more legible way; e.g.

$myVar = 1_000_000

Today we can get away with converting a string as below; but this then makes our code culture dependent.

$myVar = [int]'1,000,000'

This relates to #13590 in that both are to do with formatting numbers for legibility; only this request is for formatting the input/code, whilst #13590 is for formatting the output.

Proposed technical implementation details (optional)

No response