Update the relation data service to use new FDB API client for models

src/main/java/org/eclipsefoundation/wg/api/SysRelationData.java

-package org.eclipsefoundation.wg.api;
-
-import javax.annotation.Nullable;
-
-import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
-import com.google.auto.value.AutoValue;
-
-@AutoValue
-@JsonDeserialize(builder = AutoValue_SysRelationData.Builder.class)
-public abstract class SysRelationData {
-    public abstract String getRelation();
-
-    public abstract String getDescription();
-
-    public abstract boolean isActive();
-
-    public abstract String getType();
-
-    @Nullable
-    public abstract String getSortOrder();
-
-    public static Builder builder() {
-        return new AutoValue_SysRelationData.Builder();
-    }
-
-    @AutoValue.Builder
-    @JsonPOJOBuilder(withPrefix = "set")
-    public abstract static class Builder {
-        public abstract Builder setRelation(String relation);
-
-        public abstract Builder setDescription(String description);
-
-        public abstract Builder setActive(boolean isActive);
-
-        public abstract Builder setType(String type);
-
-        public abstract Builder setSortOrder(@Nullable String sortOrder);
-
-        public abstract SysRelationData build();
-    }
-}