Support indexing with end at the autoupdates

[ismailsenoz]

Currently autoupdates do not support updating when statistics are indexed by end as in the example

update = @autoupdates begin
    mx = mean(q(x))[1:end-1]
    Vx = cov(q(x))[1:end-1, 1:end-1]  
end

It would be nice to allow this for convenience.

[wouterwln]

Hi! We are moving to a cleaner Epic -> Feature -> Task issue hierarchy to better organize our backlog.
This issue is currently either underspecified or not tagged appropriately.

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