Move everything from exporterhelper to component.

[bogdandrutu]

Updates #4681

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

[codecov]

Codecov Report

Merging #4899 (c7b8de3) into main (004dd4d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head c7b8de3 differs from pull request most recent head cf4fe13. Consider uploading reports for the commit cf4fe13 to get more accurate results

@@            Coverage Diff             @@
##             main    #4899      +/-   ##
==========================================
- Coverage   90.69%   90.69%   -0.01%     
==========================================
  Files         181      181              
  Lines       10618    10617       -1     
==========================================
- Hits         9630     9629       -1     
  Misses        772      772              
  Partials      216      216              

Impacted Files	Coverage Δ
component/componenttest/nop_exporter.go	100.00% <100.00%> (ø)
component/exporter.go	100.00% <100.00%> (ø)
exporter/loggingexporter/factory.go	77.35% <100.00%> (ø)
exporter/otlpexporter/factory.go	91.54% <100.00%> (ø)
exporter/otlphttpexporter/factory.go	87.62% <100.00%> (ø)
internal/testcomponents/example_exporter.go	100.00% <100.00%> (ø)

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[ItsLastDay]

Note that https://github.com/open-telemetry/opentelemetry-collector/blob/main/exporter/exporterhelper/README.md still references https://github.com/open-telemetry/opentelemetry-collector/blob/main/exporter/exporterhelper/factory.go, which you deleted in 0.47.0.