Support multiple mappers per input class type

[Luca Spinazzola]

In KamelConfig it would need to support multiple mappers per KClass

public val mappers: Map<KClass<*>, Mapper<Any, Any>> -> public val mappers: Map<KClass<*>, List<Mapper<Any, Any>>>

and would need to be handled here:

https://github.com/Kamel-Media/Kamel/blob/c83ef4ae6ad05bd58a00a51352bda7068057cd02[…]l-core/src/commonMain/kotlin/io/kamel/core/utils/ConfigUtils.kt