48 ability to import modules during startup of powershell runspace

[santisq]

Adds -ModuleNames and -ModulePaths parameters to Invoke-Parallel:

• Introduce -ModuleNames to import system-installed modules via $env:PSModulePath.
• Add -ModulePaths to load custom modules from specified directories.
• Updates README and docs with examples and usage notes.
• Simplify module integration, removing need for manual Import-Module in script blocks.
• Add Pester tests for new parameters.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.27%. Comparing base (5a5582b) to head (9fbb6d8).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   97.22%   98.27%   +1.05%     
==========================================
  Files          12       13       +1     
  Lines         504      580      +76     
  Branches       34       42       +8     
==========================================
+ Hits          490      570      +80     
+ Misses          9        5       -4     
  Partials        5        5              

Flag	Coverage Δ
PS-5.1	98.85% <100.00%> (+1.13%)	⬆️
PS-7_Linux	98.27% <100.00%> (+1.05%)	⬆️
PS-7_Windows	98.85% <100.00%> (+1.13%)	⬆️

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