diag: find 'Java heap space' error when inspect offline

And give a hint:
spark.driver.memory，spark.executor.memory in spark conf, add to where, and the format

Look for the diagnostic tool or offline inspection code in the OpenMLDB codebase that handles Spark errors. Identify where 'Java heap space' errors are caught and where hints about spark.driver.memory and spark.executor.memory can be added. Check Spark configuration documentation for the correct format. Test the change by triggering the error in an offline inspection scenario.

Written by the indexing model from the issue text.