Add MetricsWrapper to dissallow access to internal representation

[bogdandrutu]

Signed-off-by: Bogdan Drutu [email protected]

[codecov]

Codecov Report

Merging #2693 (84da83b) into main (df9f565) will decrease coverage by 0.00%.
The diff coverage is 95.00%.

@@            Coverage Diff             @@
##             main    #2693      +/-   ##
==========================================
- Coverage   91.84%   91.84%   -0.01%     
==========================================
  Files         289      289              
  Lines       15541    15532       -9     
==========================================
- Hits        14274    14265       -9     
  Misses        870      870              
  Partials      397      397              

Impacted Files	Coverage Δ
exporter/otlpexporter/otlp.go	69.86% <50.00%> (-0.41%)	⬇️
consumer/pdata/metric.go	99.23% <100.00%> (-0.05%)	⬇️
exporter/fileexporter/file_exporter.go	80.00% <100.00%> (-2.36%)	⬇️
exporter/prometheusremotewriteexporter/exporter.go	89.26% <100.00%> (ø)
internal/otlp_wrapper.go	100.00% <100.00%> (ø)
receiver/otlpreceiver/metrics/otlp.go	100.00% <100.00%> (ø)

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