Remove phan support

[xepozz]

We have migrated from phan to psalm partially.
I think we need to remove any phan mentions from packages.

[rugabarbo]

@samdark do we have a special place for infrastructure/general tasks? It looks like this task is about yiisoft development in general, but not about yii-dev-tool itself.

[samdark]

No, we don't. Well, Trello is more like it: https://trello.com/b/GiAnIAir/yii-3