[Feature Request]: Add option to supress application PID in Teal UI

### Feature description

I can certainly understand the value of displaying a small footer with the application process ID and session token within the main Teal module, especially for debugging. However, when an application is released to a production environment, I would prefer to hide that information as it could cause slight confusion to the users.

It would be a great enhancement to have a new argument added to either the teal module UI or server function to show/hide this specific footer, as seen in [this snippet](https://github.com/insightsengineering/teal/blob/eb373dfdfb06aaabc97a10b7c5c7ce082d6429e3/R/module_teal.R#L128-L130).

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