Add support for networkmanager to peer with AWS Transit Gateway

[NetDevAutomate]

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Description

Add a new networkmanager resource to create a peering request from a Core Network to AWS Transit Gateway.

New or Affected Resource(s)

• aws_networkmanager_transit_gateway_peering_attachment

Potential Terraform Configuration

resource "aws_networkmanager_transit_gateway_peering_attachment" "example" {
  global_network_id           = aws_networkmanager_global_network.example.id
  peer_account_id              = aws_ec2_transit_gateway.peer.owner_id
  peer_region                      = data.aws_region.peer.name
  transit_gateway_id          = aws_ec2_transit_gateway.local.id
}

[drewmullen]

I'm working on an attachment_acceptor resource that will pair with this proposal. however, the tgw type will have to be added to the acceptor

https://github.com/hashicorp/terraform-provider-aws/pull/26227

to implement you'd need to add 3 things:

1. include the type in the validation func
2. in the Create call, before AcceptAttachment is run, validate the attachment passed is not already accepted, you can copy this
3. add a reference to the waiter, example here

[ewbankkit]

New resource(s) added in #26264:

• aws_networkmanager_transit_gateway_peering
• aws_networkmanager_transit_gateway_route_table_attachment

[github-actions[bot]]

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