Use equals comparator when classes share a superclass

[APickledWalrus]

Description

This PR allows the method responsible for finding a comparator to return the equals comparator if the two classes share an immediate superclass. One issue caused by the lack of these checks is the weird comparison stuff that goes on with potions such as:

Skript/src/main/java/ch/njol/skript/util/PotionEffectUtils.java

Lines 90 to 99 in e43c37e

	// This is a stupid bandaid to fix comparison issues when converting potion datas
	@Nullable
	public static PotionEffectType parseByEffectType(PotionEffectType t) {
	for (PotionEffectType value : types.values()) {
	if (t.equals(value)) {
	return value;
	}
	}
	return null;
	}

However, I was wondering if it should compare if the classes share a common superclass at any point, not just the first level.

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Target Minecraft Versions: Any
Requirements: None
Related Issues: #4183 (needs this PR)

[APickledWalrus]

It would likely be better to register a PotionEffectType-PotionEffectType in this case, like other types do.

I will close this PR.