Feature Request: Add rule for "resource models should be used directly"

[shochdoerfer]

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Add a PHPStan rule to detect calls for getResource() in Model classes. Calling getResource() is marked as deprecated since it's not considered a good practice any more, see this thread on StackOverflow.

In the Magento source code, you'll find a few deprecated notices like "@deprecated 102.0.6 because resource models should be used directly". Those could be used to find out how to properly implement this rule.