Add extension factory helper similar with other components

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Merging #1485 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1485      +/-   ##
==========================================
+ Coverage   91.26%   91.28%   +0.01%     
==========================================
  Files         239      240       +1     
  Lines       16689    16723      +34     
==========================================
+ Hits        15231    15265      +34     
  Misses       1048     1048              
  Partials      410      410              

Impacted Files	Coverage Δ
exporter/exporterhelper/factory.go	100.00% <ø> (ø)
processor/processorhelper/factory.go	100.00% <ø> (ø)
receiver/receiverhelper/factory.go	100.00% <ø> (ø)
extension/extensionhelper/factory.go	100.00% <100.00%> (ø)
extension/fluentbitextension/factory.go	100.00% <100.00%> (ø)
extension/fluentbitextension/process.go	92.45% <100.00%> (ø)
extension/healthcheckextension/factory.go	100.00% <100.00%> (ø)
...nsion/healthcheckextension/healthcheckextension.go	92.85% <100.00%> (ø)
extension/pprofextension/factory.go	89.47% <100.00%> (+1.97%)	⬆️
extension/pprofextension/pprofextension.go	62.50% <100.00%> (-1.50%)	⬇️
... and 4 more

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