[Feature Request] Add Category and Tag to Exporter

[TannerCS]

I didn't see any mentions of categories or tags in the metrics. I think it would be a nice addition!

qbittorrent_torrent_info{name="Something",state="stalledUP",category="coolCategory",tags="cooltag1,cooltag2",size="10149981655",progress="1.0",seeders="0",leechers="0",dl_speed="0",up_speed="0",amount_left="0",time_active="83933",eta="8640000",uploaded="0",uploaded_session="0",downloaded="10149981655",downloaded_session="0",max_ratio="-1.0",ratio="0.0",} 1.0