Add parallelization for faster dependency download

[johlju]

Pull Request

Pull Request (PR) description

Changed

• When resolving dependencies using PSResourceGet, it now uses parallelization
  to more quickly get the dependencies downloaded.

Task list

• The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• Local clean build passes without issue or fail tests (build.ps1 -ResolveDependency).
• Documentation added/updated in README.md.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[johlju]

I'm not certain of this change. It might conflict when downloading modules that uses the same dependent module. 🤔 Then two modules will try to write to the same folder... Not sure it is possible to prevent that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5d47846) 81% compared to head (7d833b6) 81%.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #462   +/-   ##
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  Coverage    81%    81%           
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  Files        44     44           
  Lines      2328   2328           
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  Hits       1904   1904           
  Misses      424    424