Pekko support

[kanderson250]

Resolves #1692

This PR adds support for Apache Pekko.

Pekko is a fork of Akka 2.6. As such, the instrumentation is a direct lift of our existing Akka instrumentation.

Corresponding AITs have also been added.

[jtduffy]

Looks good. Only thing I see are the copyright messages are all 2020 (from the previous module), bit no idea if that's an issue for NR or not.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.85%. Comparing base (267afe2) to head (b2bf5a2).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #1811    +/-   ##
==========================================
  Coverage     70.84%   70.85%            
- Complexity     9951     9971    +20     
==========================================
  Files           827      829     +2     
  Lines         39880    39984   +104     
  Branches       6043     6058    +15     
==========================================
+ Hits          28254    28330    +76     
- Misses         8900     8925    +25     
- Partials       2726     2729     +3     

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