fix: make feature mappings and presence conditions serializable

Author: AlexanderSchultheiss

src/main/java/org/variantsync/vevos/extraction/gt/FeatureMapping.java

@@ -1,6 +1,8 @@
 package org.variantsync.vevos.extraction.gt;
 
-public record FeatureMapping(String mapping) {
+import java.io.Serializable;
+
+public record FeatureMapping(String mapping) implements Serializable {
 
     @Override
     public String toString() {

src/main/java/org/variantsync/vevos/extraction/gt/PresenceCondition.java

@@ -1,6 +1,8 @@
 package org.variantsync.vevos.extraction.gt;
 
-public record PresenceCondition(String condition) {
+import java.io.Serializable;
+
+public record PresenceCondition(String condition) implements Serializable {
     @Override
     public String toString() {
         return condition;