VPR Pack: C-style Arrays to C++ Vectors

[jmah76]

Related to PR #2084
Change the C arrays in vpr/pack that get delete[] called on them to C++ vectors.

Using delete[] indicates that this is some sort of array which might be an opportunity to replace with std::array or std::vector depending on the context. The requirement for delete[] should be rare if we have such containers (like what you did above already successfully with the pin_timing etc. containers)
(From #2084 (comment))

could the hill_climbing_inputs_avail be a std::vector ? They are automatically 0 initialized and we just would call resize(helper_ctx.max_cluster_size + 1) here.
(From #2084 (comment))

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