Introduce @Separator annotation for query parameters

[geoand]

This annotation allows to actually turn a String into a List automatically for each query param value

Resolves: #29528

P.S. A follow up that we might want to have is to introduce validation on the annotation's use

[geoand]

@Sgitario what do you think about this one?

[Sgitario]

I can't say I'm a big fan of this feature, but if this is something that already exists in Resteasy Classic, go for it.
The implementation looks really good to me!

[geoand]

Thanks for checking

[luca-bassoricci]

@geoand
I see @Separator is valid only for parameters, but what about @BeanParam as in below example class?

public class BeanUsedAsBeanParam
{
	@RestQuery @Separator(",")
	Set<Long> longList;
	@RestQuery @Separator(",")
	Set<String> stringList;
}

Is that not possible at all or should be a valid use case?

[geoand]

It is a valid use case. We'll need to take care of that as well

[geoand]

#29735 takes care of it

[mhagnumdw]

Is the @Separator annotation in the Quarkus documentation?

[geoand]

It seems we forgot to add it, so I opened #41146 to include it.