added OTLPHTTP collector from upstream

[pavankrish123]

Description:

Added otlphttp exporter from upstream. AppDynamics uses this standard exporter to export traces to our backend.

Link to tracking Issue:

ISSUE #104

Testing:

Tested locally with docker-compose and example application

Documentation:

Changed the README.md file to update the standard list of epxorters

[codecov-io]

Codecov Report

Merging #105 (fdd1163) into main (64d7a62) will increase coverage by 0.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   75.71%   76.05%   +0.34%     
==========================================
  Files           4        4              
  Lines          70       71       +1     
==========================================
+ Hits           53       54       +1     
  Misses          9        9              
  Partials        8        8              

Impacted Files	Coverage Δ
pkg/defaultcomponents/defaults.go	73.33% <100.00%> (+0.91%)	⬆️

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[mxiamxia]

Hi @pavankrish123, thanks for the contribution on this. Since we want to have integration test covered on each component we claimed to support in our aws otel collector. We're adding the new integ test cases for OTLPHTTP exporter. Once the test is done, we'll merge your code. Thank you in advance.

[pavankrish123]

Thanks @mxiamxia

[mxiamxia]

Hi @pavankrish123 , we have merged otlphttp exporter to main branch, it will go with the next release. Thanks.
#124

[pavankrish123]

Thank you @mxiamxia for a quick turn around!