[Feature Request]: deploy metadata in the app

[pawelru]

Feature description

As an app developer who publish my app on shinyapps.io or RSConnect I would like to know deploy metadata such as:

• deploy timestamp
• last edit timestamp
• extra: (if git repo) last commit hash, author and timestamp

This might be useful for debugging shiny apps test. We might "hide" this at some point within https://github.com/insightsengineering/teal/issues/785

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