feat: support OTEL_METRICS_EXPORTER, OTEL_EXPORTER_OTLP_METRICS_PROTOCOL

[seemk]

• It is now possible to select one more more exporters with OTEL_METRICS_EXPORTER. Currently supported values: otlp, console.
• Add support for OTEL_EXPORTER_OTLP_METRICS_PROTOCOL. Possible values: grpc (the default) or http/protobuf.

[codecov-commenter]

Codecov Report

Base: 84.08% // Head: 84.58% // Increases project coverage by +0.49% 🎉

Coverage data is based on head (c1c73c0) compared to base (1d94317).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #614      +/-   ##
==========================================
+ Coverage   84.08%   84.58%   +0.49%     
==========================================
  Files          28       28              
  Lines        1169     1213      +44     
  Branches      265      281      +16     
==========================================
+ Hits          983     1026      +43     
- Misses        186      187       +1     

Impacted Files	Coverage Δ
src/index.ts	100.00% <ø> (ø)
src/metrics/ConsoleMetricExporter.ts	11.86% <ø> (ø)
src/metrics/index.ts	93.91% <88.88%> (-1.58%)	⬇️
src/detectors/ProcessDetector.ts	89.65% <0.00%> (+3.29%)	⬆️

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