Software NGFW Hub Phase 2

[migara]

• [x] Autoscaling example for centralized design
• [x] Autoscaling example for isolated design
• [x] Panorama standalone example
• [x] #297
• [x] Remove tgw_inbound_with_alb_nlb, transit_gateway_peering, vmseries_combined_with_gwlb_natgw, vpc_endpoint examples

[sebastianczech]

All examples were delivered in #308, #327, #332 and #333