[code-quality] Add ReplaceConstantBooleanNotRector

[john-shaffer]

A negated constant boolean can be trivially changed to the other constant boolean.

class IfCondition
{
    public function run()
    {
-        if (!true) {
+        if (false) {
            return true;
        }
        return false;
    }
}

I am using this in tandem with bootstrapped constants. It allows dead code elimination rectors to remove blocks of code when the appropriate constants are defined.

[TomasVotruba]

Looks good, thank you for new rule 👍