Pekko http

[kanderson250]

Resolves #1816

This introduces instrumentation for Apache Pekko HTTP via the pekko-http and pekko-http-core libraries.

This instrumentation supports Scala 2.13, the default Scala version for Pekko.

The instrumentation is nearly a direct lift of the existing akka-http-2.13_10.1.8 and akka-http-core-2.13_10.2.0 libraries. One small instrumentation change has been made in org.apache.pekko.http.scaladsl.server.PekkoExecutionDirectives, where we now instrument createAsyncHandler instead of seal. This was necessary to avoid issues with implicit conversions that sidestepped the previous instrumentation for seal.

AITs have also been added (to be merged later), the test app and the tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.87%. Comparing base (dd32a0f) to head (20d23eb).
Report is 42 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1850      +/-   ##
============================================
- Coverage     70.90%   70.87%   -0.03%     
+ Complexity     9977     9973       -4     
============================================
  Files           829      829              
  Lines         39984    39985       +1     
  Branches       6058     6058              
============================================
- Hits          28349    28340       -9     
- Misses         8912     8915       +3     
- Partials       2723     2730       +7     

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