Support custom phpstan rules

Allow core and contrib to run phpstan how ever it likes.

added 13 commits

• 5a772900...a4319d15 - 12 commits from branch project:dev
• ecb58bb0 - Support custom phpstan rules

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added 4 commits

• ecb58bb0...4d7579ec - 3 commits from branch project:dev
• a68f9eba - Support custom phpstan rules

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merged