testing: plot heap data

[brianolson]

Summary

Improve test cluster data plotting
plot heap data in algod_go_memory_classes_heap_objects_bytes

Test Plan

Ran this on a test cluster.

[codecov]

Codecov Report

Merging #4968 (af8c479) into master (a35f4b8) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4968      +/-   ##
==========================================
- Coverage   53.67%   53.64%   -0.03%     
==========================================
  Files         432      432              
  Lines       54077    54077              
==========================================
- Hits        29025    29011      -14     
- Misses      22806    22816      +10     
- Partials     2246     2250       +4     

Impacted Files	Coverage Δ
network/wsPeer.go	66.43% <0.00%> (-2.37%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
ledger/tracker.go	74.26% <0.00%> (-0.85%)	⬇️
ledger/acctupdates.go	68.99% <0.00%> (-0.25%)	⬇️
catchup/service.go	69.80% <0.00%> (ø)
network/wsNetwork.go	65.19% <0.00%> (+0.44%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️

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