[FEA][JNI] Throw specific exception from Table.readJSON instead of AssertionError

[andygrove]

Is your feature request related to a problem? Please describe.
Per the discussion at NVIDIA/spark-rapids#9304 (comment), the Spark plugin currently has to parse the error message from an AssertionError, which is an anti-pattern. This happens when the plugin calls Table.readJSON where the input is not JSON format.

This exception is thrown in the constructor for Table:

  public Table(long[] cudfColumns) {
    assert cudfColumns != null && cudfColumns.length > 0 : "CudfColumns can't be null or empty";

Describe the solution you'd like
We should throw a specific exception instead.

Describe alternatives you've considered
None

Additional context
None