Allow to wait until peering is complete in `aws_ec2_transit_gateway_peering_attachment`

[arein]

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Description

Currently I see creating EC2 Transit Gateway Route Table Association (tgw-rtb-0adce2d3feec543ec_tgw-attach-094dc7f1085117982): IncorrectState: tgw-attach-094dc7f1085117982 is in invalid state when initially creating the peering from resources depending on the peering.

That's because the peering has not yet been established (there is manual intervention required). Autoaccepting doesn't seem to work in my case (maybe I should research that).

However, indifferent of that it would be great to have a flag to instruct the resource to wait until the peering is complete.

New or Affected Resource(s)

• aws_ec2_transit_gateway_peering_attachment

[mattwilder]

An alternative solution to this problem is outlined in #36261