ConvertTo-CimInstance add parameters for ClassName and Namespace

[dan-hughes]

Pull Request (PR) description

Add parameters to allow reuse

This Pull Request (PR) fixes the following issues

Fixes #128

Task list

• 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).
• Documentation added/updated in README.md.
• Comment-based help added/updated for all new/changed functions.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See
  DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92%. Comparing base (00506d4) to head (f56b9b1).
Report is 3 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #130   +/-   ##
===================================
  Coverage    92%    92%           
===================================
  Files        41     41           
  Lines       700    700           
===================================
  Hits        650    650           
  Misses       50     50           

Flag	Coverage Δ
	92% <100%> (ø)

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Files with missing lines	Coverage Δ
source/Public/ConvertTo-CimInstance.ps1	100% <100%> (ø)

[dan-hughes]

@johlju

[johlju]

Reviewed 2 of 3 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dan-hughes)

[johlju]

@dan-hughes awesome work as usually! 🙂