New Rule Suggestion / Rule amendment - in response to #903

In Issue #903 the rule in my opinion correctly throws on a += for simple defined arrays using the $var = @() method of defining an array to the var variable

I would suggest that a new rule is created that correctly identifies this method as being an expensive action and that a recommendation to use a fully defined Array collection would be a better suggestion, initially suggesting using a System.Collections.ArrayList

This rule should look for both @() & += and suggest converting these calls better scripting practices

Beginne mit dem Lesen von Issue #903 und der bestehenden Regel, die += für Arrays behandelt. Ermittle, wie der Analyzer sowohl @() als auch += erkennen sollte, und definiere anschließend die erforderliche Empfehlung und die Tests, die bestätigen, dass vollständig definierte Collections, zunächst System.Collections.ArrayList, vorgeschlagen werden.