[#380] fix: add MetaDataSerializer

(cherry picked from commit e2ee34c)

Author: MateuszNaKodach

kotlin/src/main/kotlin/org/axonframework/extensions/kotlin/serialization/AxonSerializers.kt

@@ -77,7 +77,7 @@ val replayTokenContextSerializer = String.serializer().nullable
  * This module includes serializers for TrackingTokens, ScheduleTokens, and ResponseTypes, enabling
  * seamless integration with Axon-based applications.
  */
-val `AxonSerializersModule` = SerializersModule {
+val AxonSerializersModule = SerializersModule {
     contextual(ConfigToken::class) { ConfigTokenSerializer }
     contextual(GapAwareTrackingToken::class) { GapAwareTrackingTokenSerializer }
     contextual(MultiSourceTrackingToken::class) { MultiSourceTrackingTokenSerializer }

kotlin/src/test/kotlin/org/axonframework/extensions/kotlin/serialization/MetaDataSerializerTest.kt

@@ -175,14 +175,6 @@ internal class AxonSerializersTest {
         assertEquals(responseType, serializer.deserializeResponseType(responseType.javaClass.name, json))
     }
 
-    @Test
-    fun metaDataSerialization2() {
-        val metaData = MetaData.with("key", "value")
-        val json = """{}"""
-        val serialized = serializer.serialize(metaData, String::class.java).data
-        assertEquals(json, serialized)
-    }
-
     private fun Serializer.deserializeTrackingToken(tokenType: String, json: String): TrackingToken =
         deserializeJson(tokenType, json)