CMDistributionGroups adding SecurityScopes

[jeffotterpohl]

Pull Request (PR) description

Adding the capability to CMDistributionGroup to allow assigning SecurityScopes via SecurityScopes (match), SecurityScopesToInclude (add), SecurityScopesToExclude (remove). Pester tests and readme have been updated.

This Pull Request (PR) fixes the following issues

Task list

• [X] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [X] Resource documentation added/updated in README.md.
• [X] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [X] Comment-based help added/updated.
• [X] Localization strings added/updated in all localization files as appropriate.
• [X] Examples appropriately added/updated.
• [X] 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 

[codecov[bot]]

Codecov Report

Merging #54 into master will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #54   +/-   ##
=====================================
  Coverage      96%    96%           
=====================================
  Files          27     27           
  Lines        2774   2823   +49     
=====================================
+ Hits         2686   2735   +49     
  Misses         88     88           

[NEllis280]

Tested and everything seems to function as expected. Will review code shortly.

[NEllis280]

Reviewed the code and all looks good.