Add GoogleSheetsConverter for public Google Sheets URLs

[bryanmull-datastack]

Recognizes https://docs.google.com/spreadsheets/d//... URLs and converts them by fetching the workbook through the public XLSX export endpoint, then delegating to XlsxConverter so every tab is rendered as a ## SheetName Markdown table.

[microsoft-github-policy-service]

@bryanmull-datastack please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

@microsoft-github-policy-service agree [company="{your company}"]

Options:

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@microsoft-github-policy-service agree

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@microsoft-github-policy-service agree company="Microsoft"

Contributor License Agreement

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