Add ClassMap@getRawPsrViolations()

[cosmastech]

Motivation

I'd like to build a step in our gitlab pipeline that confirms that all files meet the PSR-4 namespace standard.

How it can be solved now

• Use reflection to extract the $psrViolations from ClassMap, or
• Attempt to parse the strings from the warnings returned from ClassMap@getPsrViolations()

Changes

Adds a method to get the raw violations (ClassMap@getRawPsrViolations()) and add tests.