Add `availability_zone` output

[kennedy]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

When trying to create additional EBS volumes, it requires the availability_zone. The EC2 module is not outputting the AZ of itself to use as reference.

Describe the solution you'd like.

It would be very helpful to get the EC2 instance's availability_zone in the output as reference.

Describe alternatives you've considered.

Would need to create a data.aws_instance resource using the module.ec2-instance.id for the availability_zone information.

Additional context

If the data.aws_instance resource has a for_each/count loop on the module, it would have an error indicating your would need to apply the module first.

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