Feature: Add job timeout option to datasource

[nsmorales]

What this PR does / why we need it:
We have external tables which do not report how many bytes a query will scan. To attempt to control cost we can use JobTimeout in QueryConfig to limit how long a job is allowed to execute for.

A new configuration option under Additional Settings has been added to.

If I missed anything please let me know.

[cla-assistant]

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[sasklacz]

Can we add a test ? By quick looking looks like we can send a negative timeout ?

[nsmorales]

Can we add a test ? By quick looking looks like we can send a negative timeout ?

Hey.

I have added a test and have clamped the value so it doesn't allow negative values. Let me know if this is what you had in mind or if additional test in other parts of the code are needed.

Thanks.