[aggregator] Binary transform increase conditionally replaces NaN with zero

[sidneyw]

What this PR does / why we need it:
PR attempts to fix aggregator counter reset issue due to binary transform increase returning an empty datapoint when it encounters a NaN previous value.

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:
User facing configuration has changed in a backwards compatible way.

Adds static feature flags to the aggregator configuration for enabling prev NaN to zero conversion.

Does this PR require updating code package or user-facing documentation?:

NONE

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #3517 (ef4f67d) into master (af480e9) will decrease coverage by 1.7%.
The diff coverage is 4.3%.

❗ Current head ef4f67d differs from pull request most recent head 9a9c894. Consider uploading reports for the commit 9a9c894 to get more accurate results

@@           Coverage Diff            @@
##           master   #3517     +/-   ##
========================================
- Coverage    57.6%   55.9%   -1.8%     
========================================
  Files         548     549      +1     
  Lines       67373   61419   -5954     
========================================
- Hits        38873   34336   -4537     
+ Misses      25115   23978   -1137     
+ Partials     3385    3105    -280     

Flag	Coverage Δ
aggregator	57.2% <5.7%> (-0.2%)	⬇️
cluster	∅ <ø> (∅)
collector	54.3% <ø> (ø)
dbnode	60.3% <ø> (-2.0%)	⬇️
m3em	46.4% <ø> (ø)
metrics	19.8% <0.0%> (-0.1%)	⬇️
msg	74.4% <ø> (-0.2%)	⬇️

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[robskillington]

LGTM