[Req] add Comicvine Story Arc Field

[coldiak]

there´s some comic library in my Komga with Story arcs (Batman R.I.P, Dark Night: Metal) but when i try to update the full story arc only finds a TP or hardcover issue, not the full story arc summary. could be possible to add Story arc for library that contains the full story?

Batman R.I.P story Arc [https://comicvine.gamespot.com/batman-rip/4045-55116/]