AWS::EC2::VPCPeeringConnection Tagging of Peer VPC

## 1. Title
`AWS::EC2::VPCPeeringConnection` Tagging of Peer VPC

## 2. Scope of request
At the moment when creating an `AWS::EC2::VPCPeeringConnection` where a `PeerRegion` or `PeerOwnerId` is specified the peering connection created in the other account/region is not tagged with stack level tags or resource level tags. I propose modifying the resource to tag the Peer resource with the same tags as the "local" resource.

## 3. Expected behavior

When creating an an `AWS::EC2::VPCPeeringConnection` with a `PeerRegion` or `PeerOwnerId` the compliment peer that is not in the current region/account should also be tagged.

## 4. Suggest specific test cases

- Ensure tags are placed on compliment resource.
- Ensure that lack of permissions on `PeerRoleArn` to create tags does not block resource creation.

## 5. Helpful Links to speed up research and evaluation

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpcpeeringconnection.html

## 6. Category (required)

4. Networking & Content (VPC, Route53, API GW,...)