[LUA] Add Fuscous Ooze's encumbrance effect

[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 the encumbrance effect to Fuscous Ooze. Duration seems like it should be random between 30 and 45 seconds according to https://wiki.ffo.jp/html/24648.html, not much other information available.

Steps to test these changes

1. !zone Pashhow Marshlands [S]
2. !mobhere 17145979
3. !exec target:useMobAbility(2183)