refactor: Updated koa instrumentation to construct specs at instrumentation

[bizob2828]

Proposed Release Notes

• Updated koa instrumentation to construct specs at instrumentation

Links

Closes #170

Details

This cannot be merged until the agent makes a release. The CI will fail because specs are not on the shim instance in a released version of agent yet.

To test locally

# npm link main of agent
npm link
# link in this PR
npm link newrelic
npm test

[codecov]

Codecov Report

Attention: Patch coverage is 97.87234% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 94.50%. Comparing base (cae5a63) to head (f60dc6e).

Files	Patch %	Lines
lib/router-instrumentation.js	96.82%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
+ Coverage   94.18%   94.50%   +0.31%     
==========================================
  Files           6        6              
  Lines         361      382      +21     
==========================================
+ Hits          340      361      +21     
  Misses         21       21              

Flag	Coverage Δ
unit-tests-16.x	40.57% <26.59%> (+0.68%)	⬆️
unit-tests-18.x	40.57% <26.59%> (+0.68%)	⬆️
unit-tests-20.x	40.57% <26.59%> (+0.68%)	⬆️
versioned-tests-16.x	94.50% <97.87%> (+0.31%)	⬆️
versioned-tests-18.x	94.50% <97.87%> (+0.31%)	⬆️
versioned-tests-20.x	94.50% <97.87%> (+0.31%)	⬆️

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