[Core] Add Stoneskin subpower interactions for Ruszor mobskills

[ampitere]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Adds Stoneskin subpower interactions support for some unique types of Stoneskin, one which absorbs only physical and the other which only absorbs magic, breath, and non-elemental damage.

Steps to test these changes

https://www.bg-wiki.com/ffxi/Category:Ruszor

1. !zone Beaucedine Glacier [S]
2. !mobhere 17334289
3. !exec target:useMobAbility(2438) - Frozen Mist
4. Effect should absorb 1000 physical damage, while active mob will absorb Ice damage
5. !exec target:useMobAbility(2439) - Hydro Wave
6. Effect should absorb 1500 magic, breath, and non-elemental damage, while active mob will absorb Water damage

[ampitere]

Going to keep this as a draft until mobskills are done.