Remove duplicate and unnecessary otlp exporter wrapper

[bogdandrutu]

For some reasons github does not see the same diff:

[rmduplicate c66a306b] Remove duplicate and unnecessary otlp exporter wrapper
 2 files changed, 97 insertions(+), 18 deletions(-)
 rename exporter/otlpexporter/{exporter.go => otlp.go} (77%)

Steps:

• Move push funcs to exporter.go
• Remove unnecessary exporterImp.exportXYZ by calling directly exporterImp.w.exportXYZ from the push functions.
• Move stop once logic to exporterImp.
• Move New functions to the factory.
• Move the new exporter.go -> otlp.go

[codecov]

Codecov Report

Merging #1372 into master will increase coverage by 0.01%.
The diff coverage is 70.86%.

@@            Coverage Diff             @@
##           master    #1372      +/-   ##
==========================================
+ Coverage   90.11%   90.13%   +0.01%     
==========================================
  Files         217      216       -1     
  Lines       15242    15211      -31     
==========================================
- Hits        13736    13711      -25     
+ Misses       1096     1091       -5     
+ Partials      410      409       -1     

Impacted Files	Coverage Δ
exporter/otlpexporter/factory.go	78.72% <68.75%> (-21.28%)	⬇️
exporter/otlpexporter/otlp.go	69.56% <71.57%> (-2.59%)	⬇️
translator/internaldata/resource_to_oc.go	86.04% <0.00%> (+2.32%)	⬆️

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