Move MetricsData to internaldata

[bogdandrutu]

Fixes #2482

Signed-off-by: Bogdan Drutu bogdandrutu@gmail.com

[codecov]

Codecov Report

Merging #2512 (d94eec1) into main (6ad7d67) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2512   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files         271      271           
  Lines       15444    15444           
=======================================
  Hits        14212    14212           
  Misses        850      850           
  Partials      382      382           

Impacted Files	Coverage Δ
translator/internaldata/oc_to_metrics.go	91.24% <ø> (ø)
...eceiver/opencensusreceiver/ocmetrics/opencensus.go	92.72% <100.00%> (ø)
...eceiver/prometheusreceiver/internal/transaction.go	90.69% <100.00%> (ø)
translator/internaldata/metrics_to_oc.go	97.83% <100.00%> (ø)

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