fix(Core/Spells): Shriveling Gaze

[avarishd]

Changes Proposed:

• Attempt to "script" the spell.

Issues Addressed:

• Closes https://github.com/chromiecraft/chromiecraft/issues/4994
• Closes https://github.com/azerothcore/azerothcore-wotlk/issues/15005

SOURCE:

https://www.youtube.com/watch?v=d3UGjMSl5eI&t=132s

Tests Performed:

• tested

How to Test the Changes:

.aura 37589 See if it starts at 20 stacks and drops by 1 each second.

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REMEMBER: when testing a PR that changes something generic (i.e. a part of code that handles more than one specific thing), the tester should not only check that the PR does its job (e.g. fixing spell XXX) but especially check that the PR does not cause any regression (i.e. introducing new bugs).

For example: if a PR fixes spell X by changing a part of code that handles spells X, Y, and Z, we should not only test X, but we should test Y and Z as well.