BigQuery: include query parameters in QueryJobConfiguration

[tswast]

I notice that QueryRequest.Builder has methods to add positional and named parameters, but QueryJobConfiguration.Builder does not.

After a discussion with the BigQuery engineering team, I'm updating all the Java samples to create a job directly (jobs.insert) rather than use the query method (jobs.query). I won't be able to update the samples that use query parameters until these methods are included in the QueryJobConfiguration class.

[garrettjonesgoogle]

This was incidentally completed as part of #2323 .