Feature: Single workload scanning with polaris

[danielsagi]

Due to the new release of the single workload scanning method of polaris (in version 1.2),
This PR integrates this feature.
From now on, instead of scanning the entire cluster for config audits, you just run:

$ kubectl starboard polaris deploy/my-deployment

Internal change

This introduced a change in the way we map aliases of kinds to full kinds QN
Up until now we used a switch case for resolving kind names. this method is not robust enough and can fail in some situations.
The correct way to do that, (and what this PR is introducing) is to use RESTMapper

Other than the general correctness of using a Mapper instead of a switch case,
We needed a way to figure out the api version and group name for kinds/resources when we pass the resource argument to polaris.

Tests change

Because we now use a RESTMapper rather than a static function. the test for resolving kinds has changed to be an integration test.

closes #29

[codecov]

Codecov Report

Merging #118 into master will decrease coverage by 1.27%.
The diff coverage is 19.04%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
- Coverage   39.86%   38.58%   -1.28%     
==========================================
  Files          33       33              
  Lines        1801     1827      +26     
==========================================
- Hits          718      705      -13     
- Misses       1003     1034      +31     
- Partials       80       88       +8     

Impacted Files	Coverage Δ
pkg/cmd/get_configaudit.go	44.73% <0.00%> (-3.84%)	⬇️
pkg/cmd/get_report.go	34.37% <0.00%> (-3.56%)	⬇️
pkg/cmd/get_vulnerabilities.go	46.15% <0.00%> (-3.85%)	⬇️
pkg/polaris/converter.go	5.00% <0.00%> (+1.15%)	⬆️
pkg/polaris/scanner.go	0.00% <0.00%> (ø)
pkg/cmd/polaris.go	18.91% <8.33%> (-3.31%)	⬇️
pkg/cmd/find_vulnerabilities.go	71.92% <50.00%> (-2.15%)	⬇️
pkg/kube/object.go	63.15% <50.00%> (+0.41%)	⬆️
pkg/cmd/commands.go	61.90% <63.63%> (-28.34%)	⬇️
pkg/scanners/base.go	0.00% <0.00%> (ø)
... and 3 more

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