[PKHeX Plugin] SWSH Raid Plugin (Leanny's Plugin) 26.03.20 compatibility + rewrite 2.0.0

Leanny's plugin for SWSH has not been supported by PKHeX for a few years.
The file here is an attempt to update the plugin to work for the current PKHeX.Core.

Original Github:
https://github.com/Leanny/PKHeX_Raid_Plugin