Add appdynamicscloud metric provider

[charleslin-appd]

AppDynamics Cloud offers full-stack observability for large, managed Kubernetes deployments. I would like to use its metrics in flagger.

[charleslin-appd]

Hi @stefanprodan, I think the PR is ready for review. Please let me know if I can provide anything else. I would love to get this into the next release.

Thank you,

Charles

[charleslin-appd]

I believe the DCO check is passed. Any chance for getting the PR reviewed?

[codecov-commenter]

Codecov Report

Base: 54.37% // Head: 54.23% // Decreases project coverage by -0.14% :warning:

Coverage data is based on head (134f92e) compared to base (05d08d3). Patch coverage: 39.02% of modified lines in pull request are covered.

:exclamation: Current head 134f92e differs from pull request most recent head 2608dc6. Consider uploading reports for the commit 2608dc6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1360      +/-   ##
==========================================
- Coverage   54.37%   54.23%   -0.14%     
==========================================
  Files          84       85       +1     
  Lines       10044    10172     +128     
==========================================
+ Hits         5461     5517      +56     
- Misses       3927     3983      +56     
- Partials      656      672      +16     

Impacted Files	Coverage Δ
pkg/metrics/providers/factory.go	0.00% <0.00%> (ø)
pkg/metrics/providers/appdynamicscloud.go	39.66% <39.66%> (ø)
pkg/router/istio.go	76.98% <0.00%> (+0.09%)	:arrow_up:
pkg/controller/scheduler_metrics.go	37.64% <0.00%> (+0.74%)	:arrow_up:
pkg/metrics/observers/render.go	62.50% <0.00%> (+18.75%)	:arrow_up:

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