update: Add matrix id to user object model

• Add matrix id to user object model

efservices/src/main/java/org/eclipsefoundation/efservices/api/models/EfUser.java

@@ -68,6 +68,9 @@ public abstract class EfUser {
 
     public abstract String getWebsite();
 
+    @Nullable
+    public abstract String getMxid();
+
     public abstract Country getCountry();
 
     @Nullable
@@ -129,6 +132,7 @@ public abstract class EfUser {
                 .setOrg(null)
                 .setJobTitle("bot")
                 .setWebsite("")
+                .setMxid("")
                 .setCountry(Country.builder().build())
                 .setInterests(Collections.emptyList())
                 .setPublicFields(Collections.emptyList())
@@ -177,6 +181,8 @@ public abstract class EfUser {
 
         public abstract Builder setWebsite(String website);
 
+        public abstract Builder setMxid(@Nullable String mxid);
+
         public abstract Builder setCountry(Country country);
 
         public abstract Builder setBio(@Nullable String bio);