* [HUDI-1870] Add more Spark CI build tasks - build for spark3.0.x - build for spark-shade-unbundle-avro - fix build failures - delete unnecessary assertion for spark 3.0.x - use AvroConversionUtils#convertAvroSchemaToStructType instead of calling SchemaConverters#toSqlType directly to solve the compilation failures with spark-shade-unbundle-avro (#5) Co-authored-by: Yann <biyan900116@gmail.com>