split exporter into its own module

[codeboten]

Adds the exporter component as its own module.

Fixes #7239

Will rebase after #7195

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4a77030) 90.90% compared to head (7c516c7) 90.90%.

❗ Current head 7c516c7 differs from pull request most recent head 9b7d28b. Consider uploading reports for the commit 9b7d28b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7240   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files         293      291    -2     
  Lines       14077    14049   -28     
=======================================
- Hits        12796    12771   -25     
+ Misses       1013     1009    -4     
- Partials      268      269    +1     

Impacted Files	Coverage Δ
obsreport/obsreport_exporter.go	95.80% <0.00%> (-2.10%)	⬇️
extension/experimental/storage/nop_client.go
extension/experimental/storage/storage.go

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