This PR includes refactoring for the Find-PSResource cmdlet. This cmdlet searches for requested packages.

Note:

• At the moment this PR just includes core Find-PSResource functionality (ResourceNameParameterSet).
• DscResourceNameParameterSet, CommandNameParameterSet, TagParameterSet, TypeParameterSet soon to be completed.
• The code is refactored into a FindHelper.cs class so that Publish-PSResource may also utilize it.
• Resolves issues #281 #284 #259 #247 #201 #109 #173 #212 #264

PR Summary

Summary for this PR:

• refactored Find-PSResource.cs
• added tests with production module in this PR
• updated help and design docs for this cmdlet in this PR.
• add formatting for PSResourceInfo objects

PR Context

PR Checklist

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