Monitoring step

[cristianvasquez]

Operation: throughput

print the date-time of the first chunk occurrence
print the total count + chunk per minute or interval

<throughput>
    a                  p:Step ;
    code:implementedBy [ a         code:EcmaScriptModule ;
                         code:link <node:barnard59-base/throughput.js#default> ] .
`

[codecov-commenter]

Codecov Report

Merging #28 (5aece3c) into master (d710a5d) will increase coverage by 1.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   94.53%   95.65%   +1.11%     
==========================================
  Files           6        7       +1     
  Lines         238      299      +61     
==========================================
+ Hits          225      286      +61     
  Misses         13       13              

Impacted Files	Coverage Δ
throughput.js	100.00% <100.00%> (ø)

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[tpluscode]

Closing in favor of the hook idea from zazuko/barnard59#111