Change the `hasRequiredMarker` implementation to the 3.x specification

[k163377]

The hasRequiredMarker is currently implemented in the KotlinAnnotationIntrospector so that the old required flag does not override the kotlin-module process.
On the other hand, this will override processing by other AnnotationIntrospectors, and therefore will also override the user's own specifications.

In 3.x, the old required flag will be ignored if it is false, so that the kotlin-module process is not overridden.
Therefore, hasRequiredMarker will be moved to KotlinNamesAnnotationIntrospector to avoid overriding user specifications as much as possible.
During this, considerations for JsonProperty annotations in the current implementation will also be removed as they are no longer needed.