Don't throw exception in BigQueryResultSet.close()

[SButterfly]

Is your feature request related to a problem? Please describe.
Connection.execute*() nethods return BigQueryResult, which contains BigQueryResultSet the inheritor of ResultSet.
Most of the methods of BigQueryResultSet are not implemented including close().
Unfortunately, IntelliJ Idea strongly suggests wrapping ResultSet into try-with-resources block, which we can't do because it will trow an exception.

Describe the solution you'd like
Don't throw 'Not implemented' exception in the close method.

Describe alternatives you've considered
Fully implement close method to free underlying resources.

Additional context
IntelliJ Idea's waring: