Impl Block#getItem for BlockPipe

[MCTian-mi]

What

Basically like #2555 but for pipe block
IDK if the ugly cast to raw type can be avoided here or it's just a ja:B:a moment

[Zorbatron]

Failing spotless :p (Unfortunately you have to do obj instanceof IPipeTile<?, ?>pipeTile, note there is no space between the > and p)

[MCTian-mi]

Failing spotless :p (Unfortunately you have to do obj instanceof IPipeTile<?, ?>pipeTile, note there is no space between the > and p)

🤯 wait that's what spotless apply give me
but anyways