[FxCop] Svg preview handler

[crutkas]

Summary of the Pull Request

Getting SVG handler working. Note due to namespace and object collision, renamed namespace to more holistic naming matching what we did on the markdown PR

PR Checklist

• Applies to [Chore] Enable Static analysis (FxCopAnalyzers) on C# Projects #5129
• CLA signed. If not, go over here and sign the CLA
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

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Validation Steps Performed

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