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

• [x] The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• [x] Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• [x] 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.
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

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##           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