chore(EntityPool): workaround "unchecked generics array creation" for getEntitiesWith

[keturn]

Java generic types are a mess, especially where varargs are involved. We can't use @SafeVarargs on interface methods because there is no way to know the implementations of the interface are safe.

In this case, in practice, there are few (if any) callers that pass more than two values.
By adding methods that explicitly take one and two values, we can present an interface the compiler doesn't need to complain about at every call site.

How to Test

• find any caller of entityManager.getEntitiesWith(SomeComponent.class)
• notice unhappy compiler and IDE messages about "unchecked generics array creation for varargs parameter"
• apply PR
• notice lack of unhappy compiler and IDE messages

[keturn]

I guess the alternative would be seeing if we can globally disable varargs-related warnings? I've read the FAQ but I still feel like this should be a check on the implementation, not at every call site.

As long as methods aren't writing to the varargs array, it doesn't seem like something to worry about. Am I missing something?

[jdrueckert]

Tests out fine 👍