[SPARK-4394][SQL] Data Sources API Improvements

This PR adds two features to the data sources API:
 - Support for pushing down `IN` filters
 - The ability for relations to optionally provide information about their `sizeInBytes`.

Author: Michael Armbrust <michael@databricks.com>

Closes #3260 from marmbrus/sourcesImprovements and squashes the following commits:

9a5e171 [Michael Armbrust] Use method instead of configuration directly
99c0e6b [Michael Armbrust] Add support for sizeInBytes.
416f167 [Michael Armbrust] Support for IN in data sources API.
2a04ab3 [Michael Armbrust] Simplify implementation of InSet.
[SPARK-4398][PySpark] specialize sc.parallelize(xrange)

`sc.parallelize(range(1 << 20), 1).count()` may take 15 seconds to finish and the rdd object stores the entire list, making task size very large. This PR adds a specialized version for xrange.

JoshRosen davies

Author: Xiangrui Meng <meng@databricks.com>

Closes #3264 from mengxr/SPARK-4398 and squashes the following commits:

8953c41 [Xiangrui Meng] follow davies' suggestion
cbd58e3 [Xiangrui Meng] specialize sc.parallelize(xrange)