feat: adding step 'pods converge to selector' + fix: CI & syntax

[garomonegro]

• adds new step implemented by PodsInNamespaceWithLabelSelectorConvergeToFieldSelector
• fixes syntax generation broken by the new step
  • adds replace package to better handle the replacement of brackets in the syntax generation.
• fixes CI broken by codecov
• splits CI / make all into CI / build-test-coverage & CI / syntax for clarity
• renames golangci-lint / lint to CI / golangci-lint for consistancy
• adds codecov.yml

[codecov]

Codecov Report

Attention: Patch coverage is 75.71429% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 45.80%. Comparing base (72fe744) to head (3309dcb).
Report is 1 commits behind head on master.

Files	Patch %	Lines
pkg/kube/pod/pod.go	64.28%	5 Missing and 5 partials ⚠️
generate/syntax/main.go	0.00%	2 Missing ⚠️
generate/syntax/replace/replace.go	93.93%	1 Missing and 1 partial ⚠️
pkg/kube/kube.go	0.00%	2 Missing ⚠️
kubedog.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   53.20%   45.80%   -7.41%     
==========================================
  Files          12       19       +7     
  Lines        1669     1871     +202     
==========================================
- Hits          888      857      -31     
- Misses        674      900     +226     
- Partials      107      114       +7     

Flag	Coverage Δ
unittests	45.80% <75.71%> (-7.41%)	⬇️

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[kevdowney]

LGTM