@Override
  public Collection<UdfMetadata> getUdfs() {
    return udfs;
  }
Udf resolver that uses static config to return the UDFs present in the Samza SQL application
All the UDF classes are provided to this factory as a comma separated list of values for the config named
"udfClasses".
This factory loads all the udf classes that are configured, performs the validation to ensure that they extend
{@link ScalarUdf} and implement the method named "execute"
samza-sql/src/main/java/org/apache/samza/sql/impl/ConfigBasedUdfResolver.java