Add support for --tags and --tag TAGNAME in the ec2metadata script

[jhundley9109]

Add two new options to ec2metadata to query tags on a given instance if instance metadata tags are turned on.

Examples of new options:

$ ec2metadata --tags
aws:autoscaling:groupName=example-autoscaling-group-name
aws:ec2launchtemplate:version=1
etc..

$ ec2metadata --tag aws:autoscaling:groupName
example-autoscaling-group-name

Here is the article that outlines AWS's support for tags in instance metadata.
https://aws.amazon.com/about-aws/whats-new/2022/01/instance-tags-amazon-ec2-instance-metadata-service/

Perhaps this isn't 100% up to code standards but it should be pretty easy to get it there if you guys want to use it.

Thanks!

[holmanb]

@jhundley9109 Thanks for this PR. Please sign the cla.

[jhundley9109]

@holmanb I signed the CLA. Do you need anything else from me to get the tests running/to pass. I'm obviously not super familiar with the project, just needed to make some changes to this script for my use case (: