numeric-separators-style: Allow onlyIfContainsSeparator with group size

[Harpush]

Description

Require separators only for X digits and higher. For lower amount of digits check only in contains separators.

Fail

10_24
10450
1_0451

Pass

1024
1_024
10_450
10_451

Additional Info

The examamples are when 4 digits don't require separators but if exists they should be valid. 5 and above digits require separators and should be valid of course.