Add support for Enfeeble "enemies deal less damage" mods

[Blitz54]

Fixes # .

Description of the problem being solved:

I copied the similar code from a spectre from PoE1 to start. We don't check if the enemy is cursed, I guess because just having a the curse skill gem itself auto sets the "enemy is cursed" flag.

I added a separate flag to the Boss config, as "Unique". Enfeeble acts a little different in PoE2, it applies the bigger damage reduction to Normal, Magic, and Rare. And the lesser the Unique enemies. In PoE1, it applied bigger to Normal and Magic, and smaller to Rare and Unique.

Steps taken to verify a working solution:

• Checked that the damage reduction changes according to enemy selection.

Link to a build that showcases this PR:

https://maxroll.gg/poe2/pob/vc95b008

Before screenshot:

After screenshot:

Unique Boss

Set to "no"