Sailee Rane

- Update the transit resource to support edge API's - The following api's are modified by edge ` create_multicloud_primary_gateway update_edge_gateway attach_spoke_to_transit_gw create_inter_transit_gateway_peering create_multicloud_ha_gateway `

Adding new parameter bgp_bfd_polling_time to gateway config [AVX-54790](https://aviatrix.atlassian.net/browse/AVX-54790)