POC: use libkpa autoscaler instead of the built-in implementation

[Fedosin]

Fixes #

Proposed Changes

Release Note

[knative-prow[bot]]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 74.48980% with 25 lines in your changes missing coverage. Please review.

Project coverage is 80.93%. Comparing base (cada0f4) to head (e7c01f5). Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/autoscaler/scaling/libkpa_autoscaler.go	73.95%	17 Missing and 8 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15923      +/-   ##
==========================================
- Coverage   80.98%   80.93%   -0.06%     
==========================================
  Files         210      211       +1     
  Lines       16780    16876      +96     
==========================================
+ Hits        13590    13658      +68     
- Misses       2838     2856      +18     
- Partials      352      362      +10     

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[knative-prow-robot]

PR needs rebase.

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