Code cleanup

[drandell]

Mostly style and consistency changes with some new configuration options and one additional output. I don't have an org setup so I can't test this myself but I've not fundamentally changed anything here.

Changes:

• Add currency code as an option to the budget module
• Add storage class to the core module
• Closes https://github.com/terraform-google-modules/terraform-google-project-factory/issues/674
• Add description under the value in all outputs to make the code reading more consistent

[drandell]

quota_manager

doesn't make sense, this resource was GA according to the release notes in 2020? https://github.com/hashicorp/terraform-provider-google/releases/tag/v3.15.0

[comment-bot-dev]

@drandell Thanks for the PR! 🚀
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