OTLP Metrics exporting

[tsloughter]

#455

This is rough because I still don't know if we want to be passing metrics around like this instead of as a table but I think it is an ok first step.

[codecov[bot]]

Codecov Report

Base: 73.57% // Head: 73.61% // Increases project coverage by +0.03% :tada:

Coverage data is based on head (406962b) compared to base (d791c5b). Patch coverage: 81.31% of modified lines in pull request are covered.

:exclamation: Current head 406962b differs from pull request most recent head 66b9f3c. Consider uploading reports for the commit 66b9f3c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
+ Coverage   73.57%   73.61%   +0.03%     
==========================================
  Files          53       56       +3     
  Lines        1722     1751      +29     
==========================================
+ Hits         1267     1289      +22     
- Misses        455      462       +7     

Flag	Coverage Δ
api	68.77% <ø> (ø)
elixir	18.77% <ø> (ø)
erlang	75.10% <81.31%> (+0.01%)	:arrow_up:
exporter	73.27% <81.11%> (+0.39%)	:arrow_up:
sdk	79.00% <100.00%> (ø)
zipkin	51.47% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ntelemetry_exporter/src/opentelemetry_exporter.erl	66.18% <50.00%> (-6.69%)	:arrow_down:
...ps/opentelemetry_exporter/src/otel_otlp_traces.erl	83.87% <83.87%> (ø)
...ps/opentelemetry_exporter/src/otel_otlp_common.erl	85.71% <85.71%> (ø)
...s/opentelemetry_exporter/src/otel_otlp_metrics.erl	89.47% <89.47%> (ø)
apps/opentelemetry/src/otel_exporter.erl	51.35% <100.00%> (ø)

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