Publish to array endpoint

[hannahhoward]

Goals

This moves the events api publishing from publishing one event at a time to publishing to an endpoint that accepts and array of events, with a json body of the form:

{
  "events": [
    { ~event~ },
     ...
  ]
}

Implementation

• update event recorder to publish all pending events to each freed up publishing thread
• update publish step to send many events at once

[codecov-commenter]

Codecov Report

Merging #118 (6a312a1) into master (9fdfe88) will increase coverage by 0.01%. The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   14.03%   14.04%   +0.01%     
==========================================
  Files          16       16              
  Lines        2209     2207       -2     
==========================================
  Hits          310      310              
+ Misses       1884     1882       -2     
  Partials       15       15              

Impacted Files	Coverage Δ
filecoin/eventrecorder/eventrecorder.go	84.00% <81.81%> (-3.26%)	:arrow_down:
blocks/manager.go	85.00% <0.00%> (+5.00%)	:arrow_up:

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