Port curl, xml, xsql to use EXTENSIONS (#7140)

cURL: make possible to send file from buffer string

Add CURLStringFile class which works similarly to CURLFile, but
uploads a file from a string rather than a file. This avoids the
n

cURL: make possible to send file from buffer string

Add CURLStringFile class which works similarly to CURLFile, but
uploads a file from a string rather than a file. This avoids the
need to create a temporary file, or use of a data:// stream.

Basic usage:

$file = new CURLStringFile($data, 'filename.txt', 'text/plain');
curl_setopt($curl, CURLOPT_POSTFIELDS, ['file' => $file]);

Closes GH-6456.

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