detectors/dynatrace: add Dynatrace resource detector

[paulojmdias]

Ports the Dynatrace resource detector from processor/resourcedetectionprocessor/internal/dynatrace in opentelemetry-collector-contrib to a new standalone Go module go.opentelemetry.io/contrib/detectors/dynatrace.

Also registers the detector in detectors/autodetect as IDDynatrace ("dynatrace").

I'm proposing to be a codeowner of this detector together with the current code owner on the contrib side. \cc @evan-bradley

Fixes #8958
Relates #8940

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.5%. Comparing base (b0f0785) to head (a654130).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #9491     +/-   ##
=======================================
- Coverage   84.5%   84.5%   -0.1%     
=======================================
  Files        203     204      +1     
  Lines      16805   16862     +57     
=======================================
+ Hits       14215   14261     +46     
- Misses      2110    2121     +11     
  Partials     480     480             

Files with missing lines	Coverage Δ
detectors/autodetect/autodetect.go	87.1% <100.0%> (+0.1%)	⬆️
detectors/dynatrace/dynatrace.go	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.