Add Dynatrace metric exporter

[dyladan]

Description:

• Add Dynatrace metric exporter to AWS OpenTelemetry distro
• Add end to end tests following wiki description
• Add exporter to README list

Link to tracking Issue: n/a

Testing:

• Unit tests in collector contrib repository
• E2E tests pending merge Add test case for Dynatrace metric exporter aws-otel-test-framework#104

Documentation:

• Added exporter to README list following example from Datadog
• Usage documentation

/cc @arminru

[codecov-io]

Codecov Report

Merging #143 (e232429) into main (4a60bd1) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   77.63%   77.92%   +0.29%     
==========================================
  Files           4        4              
  Lines          76       77       +1     
==========================================
+ Hits           59       60       +1     
  Misses          9        9              
  Partials        8        8              

Impacted Files	Coverage Δ
pkg/defaultcomponents/defaults.go	76.47% <100.00%> (+0.71%)	⬆️

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[wyTrivail]

thanks!

[mxiamxia]

Sorry, I merged the New Relic changes and caused another conflict here. Please help to resolve the conflict and I'll merge this PR. Thanks.

[arminru]

@mxiamxia No worries, I just merged the changes again. Thanks!

[arminru]

@mxiamxia @wyTrivail I think all merge conflicts are resolved now, let me know if you need anything else.