Adds support for tags in aws provider spec

[suket22]

1. Issue, if available:
#642

2. Description of changes:

• Adding tags to the provider which will be applied to all EC2 instances and launch templates being created by Karpenter.

3. Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: TODO
• No

Wasn't sure but I think this should be documented here? - https://github.com/awslabs/karpenter/blob/main/website/content/en/docs/cloud-providers/AWS.md ? I can edit this PR to include the doc changes if everything else looks good.

Testing done

• Set up tags in the ProvisionerSpec and saw the tags get applied on both the EC2 instance and the launch templates.
• Passed in an empty tag key and saw that validation work.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[bwagner5]

We should note in the docs that these tags will not be applied if a custom launch template is used.

[ellistarn]

Consider attaching this method to the AWS struct.

AWS.GetTags() // includes both API specified tags as well as our decorated ones.

It might simplify your code a bit.

[ellistarn]

I might also lean away from the term "managed" since it's such an overloaded concept.

[suket22]

Spoke about this offline but I needed a way to separate out just our decorated tags. I wanted to compare the user's tags with our decorated ones prior to the merge so had to do it this way.

Agreed on the managed bit. I thought about calling it something like karpenterTags or controllerAppliedTags but nothing felt any nicer so just stuck with managed for now.

[geoffcline]

We should note in the docs that these tags will not be applied if a custom launch template is used.

Thanks for calling this out.