Exclude jackson-databind from shaded jar

[jrkinley]

Exclude jackson-databind from shaded .jar as it clashes with Spark's version in Cloudera Runtime 7.1.x. Looking at the dependency tree Spark includes jackson-databind:2.6.5 whereas Envelope 0.7.2 is including jackson-databind:2.3.1 as part of a kitesdk dependency.

[jrkinley]

Spark throws this exception when both versions of the jar are on the classpath:

Caused by: java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.ObjectMapper.readerFor(Ljava/lang/Class;)Lcom/fasterxml/jackson/databind/ObjectReader;
	at org.apache.hadoop.hive.common.StatsSetupConst$ColumnStatsAccurate.<clinit>(StatsSetupConst.java:176)
	at org.apache.hadoop.hive.common.StatsSetupConst.parseStatsAcc(StatsSetupConst.java:353)
	at org.apache.hadoop.hive.common.StatsSetupConst.setBasicStatsState(StatsSetupConst.java:241)
	at org.apache.hadoop.hive.common.StatsSetupConst.setStatsStateForCreateTable(StatsSetupConst.java:345)
	at org.apache.hadoop.hive.ql.metadata.Hive.loadPartitionInternal(Hive.java:2443)
	at org.apache.hadoop.hive.ql.metadata.Hive.lambda$loadDynamicPartitions$4(Hive.java:2909)
	... 4 more