Enhancement: Add Security Group Referencing Support

[drewtul]

Description

Add security_group_referencing_support argument to transit gateway resource

Relations

Closes #0000

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions[bot]]

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[ewbankkit]

@drewtul We already have an existing ongoing PR, https://github.com/hashicorp/terraform-provider-aws/pull/34542, that I am just testing now.

[drewtul]

No worries, I'll close this oen.

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