Let apps define list of sensitive config values instead of hardcoding in the server.

[fancycode]

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Is your feature request related to a problem? Please describe.
Currenty a list of sensitive config values is hardcoded in

server/lib/private/AppConfig.php

Line 47 in 8541707

protected $sensitiveValues = [

Whenever an app defines a new sensitive config value, this list must be updated in the server and the value is visible until a potential PR is merged in the server and the server has been updated.

Describe the solution you'd like
It would be better if each app could define a list of config values that should be filtered.

[joshtrichards]

Related: #33398 (but currently lacking documentation as far as I can tell)