Make use of Java 9+ immutable collections

[kashike]

[CoreyShupe]

Could we possibly have more of a description on what this is achieving and what adventure is trying to change with the use of immutable collections.

[electronicboy]

components are immutable, hence things like Lists, stored on components, are immutable; Right now the project is using Guavas immutable lists, aim here I'd imagine is to get away from Guava's given that java now offers their own standard implementations of these

[kashike]

We don't use Guava, but we do a lot of stuff like Collections.unmodifiableList(new ArrayList<>(someList)) which can just be List.copyOf(someList) with Java 9+.