[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.

packaging/hudi-spark-bundle/pom.xml

@@ -94,8 +94,6 @@
                   <include>org.apache.hive:hive-service-rpc</include>
                   <include>org.apache.hive:hive-metastore</include>
                   <include>org.apache.hive:hive-jdbc</include>
-
-                  <include>com.databricks:spark-avro_2.11</include>
                 </includes>
               </artifactSet>
               <relocations>
@@ -139,10 +137,6 @@
                   <pattern>org.apache.commons.codec.</pattern>
                   <shadedPattern>org.apache.hudi.org.apache.commons.codec.</shadedPattern>
                 </relocation>
-                <relocation>
-                  <pattern>com.databricks.</pattern>
-                  <shadedPattern>org.apache.hudi.com.databricks.</shadedPattern>
-                </relocation>
                 <!-- TODO: Revisit GH ISSUE #533 & PR#633-->
               </relocations>
              <filters>