Add support for changes in csp_whitelist.xml files

[hostep]

Hi there

I just saw this Magento2 PR being merged: https://github.com/magento/magento2/pull/38991/files?w=1

And thought it might be a good idea that this tool could detect changes to these CSP whitelist files, and display the changes as an INFO-type of message. Similar to how changes in queue_consumer.xml or db_schema.xml are being outputted.

Thanks!

[convenient]

This does sound like a worthwhile addition.