Model Application behavior

[AzeemJiva]

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Heapothesys should have a mode to allow modeling of application behavior. This includes object size variability, variable allocation rates, peak and off-peak allocation, and potentially other ideas.

[amicic]

This framework provides variability of object sizing and allocation rate: https://github.com/AdoptOpenJDK/openjdk-tests/tree/master/functional/SyntheticGCWorkload