@JsonNames does not work on enums

[DavyHubrecht]

Describe the bug

The @JsonNames annotation to provide alternative names when decoding json does not work on enums.

To Reproduce

Create an enum with @JsonNames, for example:

@Serializable
enum class SomeEnum {
    @JsonNames("someValue", "some_value", "test")
    SOME_VALUE
}

Trying to decode a json with one of the JsonNames will result in a SerializationException:
kotlinx.serialization.SerializationException: com.zorabots.mqtt.model.filtering.SomeEnum does not contain element with name 'someValue'

Expected behavior

"SOME_VALUE", "someValue", "some_value" or "test" should work, instead of only "SOME_VALUE".

Environment

• Kotlin version: 1.5.0
• Library version: 1.2.0
• Kotlin platforms: JVM
• Gradle version: 6.1.1