feat: Add Bedrock mock server

[jsumners-nr]

Proposed Release Notes

• Adds a new module that provides a mock server for AWS Bedrock.

Links

Details

This is in support of newrelic/node-newrelic#1968

[codecov]

Codecov Report

Attention: 133 lines in your changes are missing coverage. Please review.

Comparison is base (71923d4) 77.97% compared to head (c1762f1) 80.07%.

Files	Patch %	Lines
lib/bedrock-server/index.js	48.24%	133 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   77.97%   80.07%   +2.10%     
==========================================
  Files          15       23       +8     
  Lines        2424     3347     +923     
==========================================
+ Hits         1890     2680     +790     
- Misses        534      667     +133     

Flag	Coverage Δ
unit-tests-16.x	80.07% <85.59%> (+2.10%)	⬆️
unit-tests-18.x	?
unit-tests-20.x	?

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