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added feature of obtaining scalar varaible from a function w/o the default

Tomasz Bold requested to merge tbold/athena:add-option-for-monitored-scalar-to-act-as-object into master

With this feature additional approach to monitoring a single object can be used. That is, user can provide functor that is called when the value needs to be obtained. The usecase was to monitor collection size.

auto size = Monitored::Scalar("cellsSize", [&](){ return cells->size(); })

Tagging @fwinkl

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