[SC-295] H-1 add storage slot gaps to layout

[0xNuggan]

What has been done

Added a storage gap to all upgradeable modules.

Open question

I also added gaps to non-upgradeable abstract contracts if they are going to be inherited by upgradeable ones. This specifically applies to the Bonding Curve contracts, where the Base contracts don't inherit from Module_v1. I'd be thankful for a double-check in that department.