rgw: fix multipart upload listing

rgw: fix multipart upload listing

Fixes: #7169
A separate fix has been created for dumpling.

Previously we read the entire list of parts, disregarding the actual
marker and the requested max parts. This fix refactors the way we read
the list of parts (doing it in parts, using marker).

Create new upload-id format that is used to identify uploads with sorted
omap entries. Make sure we're backward compatible and handle correctly
mixed-versions rgw uploads.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>