Add collect_heap_pprofs.sh script for easier collection of heap profiles

[ddelnano]

Summary: Add collect_heap_pprofs.sh script for easier collection of heap profiles

I've been profiling PEM memory usage often. The existing script was difficult to use when collecting profiles across an entire cluster -- the download_heap_prof_mapped_files.sh script hard codes a file path causing each profile to overwrite the previously downloaded one.

This new script orchestrates collecting the heap profiles via the px cli and uses a modified version of the download_heap_prof_mapped_files.sh to collect the memory mapped files.

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: Script runs successfully on cluster with 9 nodes and pprof command printed to console works

$ ./scripts/collect_heap_pprofs.sh heap_capture <vizier_id> --project=<gcp_project>

$ PPROF_BINARY_PATH=heap_capture/gke-csmc-new--csmc-node-pool-c67a9bcf-v31i pprof -http=localhost:8888 heap_capture/gke-csmc-new--csmc-node-pool-c67a9bcf-v31i.txt
Serving web UI on http://localhost:8888
[1651124:1651124:0328/060122.987270:ERROR:ozone_platform_x11.cc(244)] Missing X server or $DISPLAY
[1651124:1651124:0328/060122.987541:ERROR:env.cc(258)] The platform failed to initialize.  Exiting.