Initial attempt at replacing MSOL module references with cmdlets from newer AzureAD module

[brianlala]

Pull Request (PR) description

Initial attempt at replacing MSOL module references with cmdlets from newer AzureAD module.

This Pull Request (PR) fixes the following issues

- Addresses #19 

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md in the resource folder.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

---

This change is 

[codecov-io]

Codecov Report

Merging #49 into Dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              Dev      #49   +/-   ##
=======================================
  Coverage   93.14%   93.14%           
=======================================
  Files           6        6           
  Lines         525      525           
  Branches        1        1           
=======================================
  Hits          489      489           
  Misses         35       35           
  Partials        1        1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7fd6e83...8ab4df1. Read the comment docs.

[NikCharlebois]

Reviewed 1 of 1 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved