[WIP] Add fast commit log encoding path

[robskillington]

No description provided.

[codecov]

Codecov Report

Merging #1159 into ra/batches will decrease coverage by 23.6%.
The diff coverage is 71.1%.

@@              Coverage Diff              @@
##           ra/batches   #1159      +/-   ##
=============================================
- Coverage        71.4%   47.8%   -23.7%     
=============================================
  Files             725     711      -14     
  Lines           60670   59440    -1230     
=============================================
- Hits            43340   28415   -14925     
- Misses          14561   28412   +13851     
+ Partials         2769    2613     -156

Flag	Coverage Δ
#aggregator	54.3% <ø> (-27.3%)	⬇️
#cluster	29.1% <ø> (-56.9%)	⬇️
#collector	48% <ø> (-30.2%)	⬇️
#dbnode	68.4% <71.1%> (-12.6%)	⬇️
#m3em	45.7% <ø> (-27.5%)	⬇️
#m3ninx	54.2% <ø> (-21.2%)	⬇️
#m3nsch	100% <ø> (+48.8%)	⬆️
#metrics	18.3% <ø> (ø)	⬆️
#msg	74.9% <ø> (ø)	⬆️
#query	<.1% <ø> (-64.3%)	⬇️
#x	47.4% <ø> (-27.8%)	⬇️

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[richardartoul]

Closing in favor of: #1160