title: Delta table configuration in open source and databricks version are different
body: <p>I'm trying to setup the isolation level to Serializable on open source delta using azure synapse notebook.</p>
  <p>Command :</p>
  <pre><code>ALTER TABLE schema.table SET TBLPROPERTIES ('delta.isolationLevel' = 'Serializable')
  </code></pre>
  <p>It seems like delta is not able to identify the configuration</p>
  <pre><code>Error: Unknown configuration was specified: delta.isolationLevel org.apache.spark.sql.delta.DeltaErrors$.unknownConfigurationKeyException(DeltaErrors.scala:398) org.apache.spark.sql.delta.DeltaConfigsBase.$anonfun$validateConfigurations$3(DeltaConfig.scala:147) scala.Option.getOrElse(Option.scala:189) org.apache.spark.sql.delta.DeltaConfigsBase.$anonfun$validateConfigurations$1(DeltaConfig.scala:147) scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238)
  </code></pre>
  <p>The same command works in databricks delta. Is this expected ? Why is this inconsistency between databricks delta and open delta ?</p>