Support @inbounds for queue (and other data structures)

I saw that for queue the methods deque, first and probably some other always check, if the queue is empty and throw an error in that case. These are a lot of unnecessary checks (unless the compiler is so clever) when you have a loop like

while !isempty(q)
    x = first(q)
    ...
    dequeue!(q)
end

Would it make sense to allow using @inbounds for such methods? I could make some PRs for that.
This might be a breaking change though, in case someone was already using these methods inside a @inbounds block and caught the error on purpose.

On the other hand, apparently Julia Dicts also do not allow one to disable boundchecks with @inbounds.

Start by reviewing the queue entry points deque, first, isempty, and dequeue!, then compare the issue's stated behavior with how Julia Dict handles @inbounds. Done means the scope and semantics for disabling empty-check errors in queue and other data structures are decided and covered by appropriate tests.