[Refactor] Move kubernetes log code to pkg/skaffold/kubernetes/logger

[nkubala]

this change moves the logging related code in the kubernetes package to its own logger package. this will make it easier to reuse later when we embed the logging functionality inside the deployer.

also, move some unrelated image tracking logic out from the logging code.

this change is non-functional.

[codecov]

Codecov Report

Merging #5761 (7362055) into master (21e3c95) will decrease coverage by 0.24%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##           master    #5761      +/-   ##
==========================================
- Coverage   70.89%   70.65%   -0.25%     
==========================================
  Files         421      428       +7     
  Lines       16091    16174      +83     
==========================================
+ Hits        11408    11428      +20     
- Misses       3849     3906      +57     
- Partials      834      840       +6     

Impacted Files	Coverage Δ
pkg/skaffold/runner/dev.go	71.82% <ø> (ø)
pkg/skaffold/runner/logger.go	40.00% <0.00%> (ø)
pkg/skaffold/schema/latest/v1/config.go	58.82% <ø> (ø)
pkg/skaffold/schema/v2beta14/upgrade.go	100.00% <ø> (ø)
pkg/skaffold/schema/versions.go	82.41% <ø> (ø)
pkg/skaffold/schema/v2beta15/config.go	20.58% <20.58%> (ø)
pkg/skaffold/kubernetes/image_list.go	100.00% <100.00%> (ø)
pkg/skaffold/kubernetes/logger/log.go	42.45% <100.00%> (ø)
pkg/skaffold/schema/v2beta15/upgrade.go	100.00% <100.00%> (ø)
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
... and 8 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 789d058...7362055. Read the comment docs.

[MarlonGamez]

Do we have to change the license header year to 2021 for pkg/skaffold/kubernetes/logger/log.go? Not sure how simply moving a file works with that

[nkubala]

Do we have to change the license header year to 2021 for pkg/skaffold/kubernetes/logger/log.go? Not sure how simply moving a file works with that

the convention we follow is to only change the year in the license header for new files, otherwise we'd have to constantly update them and we'd forget all the time.