debug: unmarshal and print transaction distribution

[cce]

Summary

Support for parsing and printing the transaction processing time histogram buckets in an easier-to-read format.

Test Plan

Updated tests in metrics_test

[codecov]

Codecov Report

Merging #5008 (33e4286) into master (ecdcbf9) will increase coverage by 0.03%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #5008      +/-   ##
==========================================
+ Coverage   53.63%   53.67%   +0.03%     
==========================================
  Files         432      432              
  Lines       54057    54093      +36     
==========================================
+ Hits        28996    29033      +37     
+ Misses      22818    22811       -7     
- Partials     2243     2249       +6     

Impacted Files	Coverage Δ
logging/telemetryspec/metric.go	81.91% <83.33%> (+0.88%)	⬆️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/transactions/verify/txn.go	70.24% <0.00%> (-0.49%)	⬇️
network/wsNetwork.go	64.92% <0.00%> (+0.17%)	⬆️
catchup/service.go	69.80% <0.00%> (+0.48%)	⬆️
network/wsPeer.go	69.03% <0.00%> (+2.60%)	⬆️
... and 2 more

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