Support generating Test Report

[BMW1Addict]

Add support to generate Test report to configured/specified report folder.

• Add support for "python.testing.reportFolder" in settings.json (e.g. "python.testing.reportFolder": "{$workspaceFolder}${pathSeparator}report")
• Add support for "python.testing.reportFormat" in settings.json (e.g. "python.testing.reportFormat": "HTML" # Allows for future PDF format support if desired)
• Add support for "python.testing.reportCSSFile" in settings.json (e.g. "python.testing.reportCSSFile": "{$workspaceFolder}${pathSeparator}docs${pathSeparator}TestReport.css")
• Add support for "python.testing.generateReport" in settings.json (e.g. "python.testing.generateReport": true)

Thank you.