feat: Add support for security group referencing to transit-gateway m…

[syedimranhassan]

…odule

Added support for security_group_referencing_support in the transit-gateway module.

Description

Motivation and Context

AWS recently introduced [HERE] security group referencing for Transit Gateway VPC attachments. This feature was available in the standalone resource aws_ec2_transit_gateway_vpc_attachment but not in the transit-gateway module. Added support for it in the module.

Breaking Changes

no

How Has This Been Tested?

• [x] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [x] I have tested and validated these changes using one or more of the provided examples/* projects
• [x] I have executed pre-commit run -a on my pull request

[jhenry82]

Would love to see this too! One comment, this new setting exists at the Transit Gateway level too, not just attachments. So the module should also have a new variable for whether to enable it on the TGW. See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ec2_transit_gateway

[syedimranhassan]

@jhenry82 Thank you for pointing that out. I've updated the code to include SG referencing support at the TGW level as well.

[syedimranhassan]

@jhenry82 Can you please review this?

[jhenry82]

I am not a maintainer of this module, my review wouldn't mean much :) I just use the module and came here to see if the feature had been added, and saw your MR. Hopefully it is able to be integrated soon.

[syedimranhassan]

@antonbabenko @bryantbiggs Can you please review this PR?

[fintonic-plaform]

We also need this functionality.