Add .net 11 base64, utf8/utf16 validation and uri.uri scheme data polyfills#557

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Add-.NET-11-Base64,-Utf8/Utf16-validation-and-Uri.UriSchemeData-polyfillsSimonCropp/Polyfill:Add-.NET-11-Base64,-Utf8/Utf16-validation-and-Uri.UriSchemeData-polyfillsCopy head branch name to clipboard