feat: knative addon for clusters

[shaneutt]

This PR adds an addon to deploy Knative on test clusters.

Supports Kong/kubernetes-ingress-controller#1637
Blocker For Kong/kubernetes-ingress-controller#1646

[codecov-commenter]

Codecov Report

Merging #77 (29d22af) into main (b0fc709) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   22.09%   22.09%           
=======================================
  Files           2        2           
  Lines         172      172           
=======================================
  Hits           38       38           
  Misses        133      133           
  Partials        1        1           

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