[HUDI-91][HUDI-12]Migrate to spark 2.4.4, migrate to spark-avro library instead of databricks-avro, add support for Decimal/Date types

- Upgrade Spark to 2.4.4, Parquet to 1.10.1, Avro to 1.8.2
- Remove spark-avro from hudi-spark-bundle. Users need to provide --packages org.apache.spark:spark-avro:2.4.4 when running spark-shell or spark-submit
- Replace com.databricks:spark-avro with org.apache.spark:spark-avro
- Shade avro in hudi-hadoop-mr-bundle to make sure it does not conflict with hive's avro version.

hudi-spark/src/test/java/HoodieJavaApp.java

@@ -104,6 +104,7 @@ public class HoodieJavaApp {
     SparkSession spark = SparkSession.builder().appName("Hoodie Spark APP")
         .config("spark.serializer", "org.apache.spark.serializer.KryoSerializer").master("local[1]").getOrCreate();
     JavaSparkContext jssc = new JavaSparkContext(spark.sparkContext());
+    spark.sparkContext().setLogLevel("WARN");
     FileSystem fs = FileSystem.get(jssc.hadoopConfiguration());
 
     // Generator of some records to be loaded in.