Spark: Implement the architecture to read default values

[rzhang10]

This PR is the sequel to #4525, it implements the default value reading semantics specified by spec #4301, to read Avro and ORC format backed files/tables in Spark.

It made the core change in BaseDataReader to support converting default values to Spark-expected constant value objects.

For ORC, it extends the OrcSchemaWithTypeVisitor to have a default-value-aware visitor to build the tree of readers based on the idToConstant map, cooperating with changes in ORCSchemaUtil.buildOrcProjection to make things work. The logic for ORC vectorized reader was also implemented.

In Avro, similar implementation techniques were used, extending and modifying AvroSchemaWithTypeVisitor and AvroSchemaUtil.buildAvroProjection respectively.

@rdblue Please take a look, Thanks!

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