Export-TargetResource Previews

[NikCharlebois]

Add the new Export-TargetResource function to all resources

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This change is 

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@fa1fc70). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage          ?   89.03%           
=========================================
  Files             ?        3           
  Lines             ?      228           
  Branches          ?        3           
=========================================
  Hits              ?      203           
  Misses            ?       22           
  Partials          ?        3

Impacted Files	Coverage Δ
...5DSC/DSCResources/MSFT_O365User/MSFT_O365User.psm1	95.5% <100%> (ø)
...SC/DSCResources/MSFT_O365Group/MSFT_O365Group.psm1	82.75% <100%> (ø)
...365DSC/DSCResources/MSFT_SPOSite/MSFT_SPOSite.psm1	88.46% <100%> (ø)

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