Add TreeStyle to PSTree

[santisq]

Reference issue: #36

• Add TreeStyle type and Get-PSTreeStyle cmdlet.
• TreeStyle Type documentation.
• Pester tests for TreeStyle type.

[codecov]

Codecov Report

Attention: Patch coverage is 96.32653% with 9 lines in your changes missing coverage. Please review.

Project coverage is 96.83%. Comparing base (d20cd59) to head (d390a6e).
Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PSTree/Commands/GetPSTreeCommand.cs	66.66%	3 Missing ⚠️
src/PSTree/PathExtensions.cs	71.42%	2 Missing ⚠️
src/PSTree/Style/TreeStyle.cs	97.80%	1 Missing and 1 partial ⚠️
src/PSTree/Exceptions.cs	90.00%	1 Missing ⚠️
src/PSTree/Style/Extension.cs	98.21%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   93.71%   96.83%   +3.11%     
==========================================
  Files          12       16       +4     
  Lines         382      569     +187     
  Branches       49       60      +11     
==========================================
+ Hits          358      551     +193     
+ Misses         22       17       -5     
+ Partials        2        1       -1     

Flag	Coverage Δ
PS-5.1	96.30% <96.32%> (+3.37%)	⬆️
PS-7_Linux	95.95% <95.51%> (+3.02%)	⬆️
PS-7_Windows	96.30% <96.32%> (+3.37%)	⬆️

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