add LPG Gateway introspection to add LPG specific routes in route_rules

[snafuz]

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Description

Add LPG gateway introspection to add LPG-specific routes to other gateways route_rules by adding a predefined value lpg. This is the same approach used for other gateways with predefined values such as drg, internet_gateway, etc..

New or Affected Resource(s)

oci_core_route_table * in oci_core_local_peering_gateway

Potential Terraform Configuration

  local_peering_gateways  = {lpg1_name = { route_table_id = "", peer_id = "possible_id_of_peered" }}
  nat_gateway_route_rules = [
    {
      destination       = "172.18.0.0/16",
      destination_type  = "CIDR_BLOCK",
      network_entity_id = "nat_gateway",
      description       = "already works, uses the id of the NAT GW created by the OKE module"
    },
    {
      destination       = "172.19.0.0/16",
      destination_type  = "CIDR_BLOCK",
      network_entity_id = "LPG@lpg1_name",
      description       = "this doesn't work right now, the network_entity_id would be the id of the LPG created above"
    }
  ]

References

Initially raised here: oracle-terraform-modules/terraform-oci-oke#514