feat: add support for Namespace Objects

[nopjmp]

This adds the ability for the commands that take a namespace to take a namespace object. This allows for Get-KubeNamespace | Get-KubePod to be used and other situations.

While we are here, clean up the naming convention and leave an alias behind to prevent backwards compatibility problems. Additionally, use const strings for ParameterSetNames to give us a compiler warning if there is a typo.

These changes try to follow how Azure PowerShell is structured.

I should have put this work into a feature branch, but I'll just force push my master branch if this gets merged in and remember to do that in the future.

[codecov[bot]]

Codecov Report

Merging #58 into master will increase coverage by 0.54%. The diff coverage is 88.67%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   71.66%   72.21%   +0.54%     
==========================================
  Files          25       25              
  Lines         600      619      +19     
==========================================
+ Hits          430      447      +17     
- Misses        170      172       +2

Impacted Files	Coverage Δ
src/Cmdlets/GetKubeNamespaceCmdlet.cs	58.82% <ø> (ø)	:arrow_up:
src/Cmdlets/GetKubeResourceCmdlet.cs	91.66% <100%> (+0.49%)	:arrow_up:
src/Cmdlets/RemoveKubePodCmdlet.cs	91.17% <100%> (+1.17%)	:arrow_up:
src/Cmdlets/GetKubeLogCmdlet.cs	70.37% <75%> (+2.37%)	:arrow_up:
src/Cmdlets/GetKubeDeploymentCmdlet.cs	63.63% <75%> (+3.63%)	:arrow_up:
src/Cmdlets/GetKubePodCmdlet.cs	63.63% <75%> (+3.63%)	:arrow_up:
src/Cmdlets/RemoveKubeResourceCmdlet.cs	87.69% <86.95%> (-1.97%)	:arrow_down:

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[nopjmp]

Closing as I don't use this anymore