remove "koku" from naming convention

[maskarb]

Wait, why!?

When we initially did this work, we named everything upstream as koku and then converted it all to cost-management for downstream. That seems fine enough, but when it comes to converting the upstream to downstream for a release, it becomes really difficult and error prone to make sure all the appropriate name changes are made. This PR will eliminate the need for making the name changes when generating the downstream code. All we will need to do for downstream releases is make sure these are set correctly to:

// +kubebuilder:object:generate:=false
-type MetricsConfig = KokuMetricsConfig
+type MetricsConfig = CostManagementMetricsConfig

// +kubebuilder:object:generate:=false
-type MetricsConfigSpec = KokuMetricsConfigSpec
+type MetricsConfigSpec = CostManagementMetricsConfigSpec

// +kubebuilder:object:generate:=false
-type MetricsConfigStatus = KokuMetricsConfigStatus
+type MetricsConfigStatus = CostManagementMetricsConfigStatus

The next downstream release will also be difficult to implement all these name changes again, but once those are converted, we won't have to do it again.

[codecov]

Codecov Report

Merging #161 (84f53f7) into main (dfe0230) will decrease coverage by 0.28%.
The diff coverage is 88.66%.

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   88.01%   87.73%   -0.28%     
==========================================
  Files          10       10              
  Lines        1468     1468              
==========================================
- Hits         1292     1288       -4     
- Misses        106      108       +2     
- Partials       70       72       +2     

Flag	Coverage Δ
unittests	87.73% <88.66%> (-0.28%)	⬇️

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Impacted Files	Coverage Δ
collector/collector.go	88.53% <ø> (ø)
collector/prometheus.go	100.00% <ø> (ø)
sources/handler.go	96.62% <ø> (ø)
controllers/kokumetricsconfig_controller.go	78.63% <87.31%> (-0.94%)	⬇️
packaging/packaging.go	81.75% <100.00%> (ø)
storage/storage.go	95.50% <100.00%> (ø)

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