feat(client): add optional in-memory cache to client

[floreks]

• Added dynamic cache support
• Dashboard is now using a single logger (klog). Logging level can be easily controlled via --v=<LEVEL> flag.
• Default log level is set to 1 and requests/responses are no longer being logged by default
• Added optional profiler flag --profiler that allows enabling go profiler
• Added optional prometheus flag --prometheus-enabled that will expose /metrics endpoint. Adding custom metrics is planned later on.
• Added dev images push from PRs to DockerHub.
• Fixed helm lint CI action
• Updated helm notes to use configured namespace instead of hardcoded one

TODO

• Add cache feature documentation and architecture overview
• Add cache args to documentation
• Review and update other args

[codecov]

Codecov Report

Attention: Patch coverage is 5.87156% with 513 lines in your changes missing coverage. Please review.

Project coverage is 35.94%. Comparing base (31d5f5d) to head (616826a).
Report is 44 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9521      +/-   ##
==========================================
- Coverage   37.08%   35.94%   -1.15%     
==========================================
  Files         283      301      +18     
  Lines       11830    14479    +2649     
  Branches      202      183      -19     
==========================================
+ Hits         4387     5204     +817     
- Misses       7168     9051    +1883     
+ Partials      275      224      -51     

[maciaszczykm]

/lgtm

[k8s-ci-robot]

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