feat(pubsys): add support for ami tags

[jmt-lab]

Issue number: #574

Closes #574

Description of changes:
Enable use of tags in amispec.toml in pubsys

Testing done:

• Created a bottlerocket build and then created a amispec.toml with:

[tags]
tag0 = "foo"
tag1 = "bar"

• Ran pubsys publish ami through cargo make
• us-west-2 ami has tag0 = "foo", tag1 = "bar"
• us-east-1 ami has global tag0 = "foo", tag1 = "bar"

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[jmt-lab]

Continued from #577 which got accidentally canceled cause of incorrect git command

[jmt-lab]

Sorry this isn't ready yet i need to add the validation logic to validate-ami

[jmt-lab]

Actually it looks like we do not do any validation of anything amispec.toml related in validate-ami aso unsure if we should change it