Missing resources in heroku-provider

[abtris]

We use Heroku very extensively and I try use terraform for describing our apps and these things are missing.

• App Feature - preboot is important feature and more (log-runtime-metrics, runtime-dyno-metadata)
• Account Feature - this is used for many labs things (metrics-beta) - optional
• Formation - I see open PR

[danp]

#14035 added heroku_app_feature.

[ghost]

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