feat: Make allowForwardedTraffic and allowGatewayTransit configurable for hub peering

[djbark]

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Description

allowForwardedTraffic and allowGatewayTransit are defaulted to true for peering_hub_outbound. As a I have firewall within the hub network that all traffic needs to be forced through (even between spokes) I would like the ability to set these to false.

Describe the solution you'd like

These additional input variables to be added:

hub_peering_allow_forwarded_traffic
hub_peering_allow_gateway_transit

Additional context

I see this is mentioned in #264 but raising a new request for visibility as this is an issue for me and I would rather not write my own custom peering.