add load of exporter app in configuration and comment on why

[tsloughter]

No description provided.

[codecov]

Codecov Report

Merging #210 (04099b7) into main (fc42690) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   35.23%   35.28%   +0.04%     
==========================================
  Files          64       64              
  Lines        3340     3341       +1     
==========================================
+ Hits         1177     1179       +2     
+ Misses       2163     2162       -1     

Flag	Coverage Δ
api	51.61% <ø> (ø)
elixir	14.03% <ø> (ø)
erlang	35.33% <100.00%> (+0.05%)	⬆️
exporter	18.58% <100.00%> (+0.03%)	⬆️
sdk	71.69% <ø> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
...ntelemetry_exporter/src/opentelemetry_exporter.erl	73.07% <100.00%> (+0.26%)	⬆️
apps/opentelemetry/src/otel_metric_accumulator.erl	79.16% <0.00%> (+2.08%)	⬆️

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