Draft: Add option to configure seeding window in velo search by triplet

This MR adds a new option to the Velo Algorithm (SeedingWindow) to match the HLT2 parameter introduced in Rec!3895 (merged). This parameter allows to skip layers in the seeding step of the tracking.

Default value is 3, it is the same as the current algorithm (no skip).

If we increase to 4, it does the following combinations:

xxx.
xx.x
x.xx

If we increase to 5:

xxx..
xx.x.
x.xx.
xx..x
x.x.x
x..xx

And so on..

WIP