Extra context of query file execution

[kremio]

While pg-promise already provides the full query as it was sent to the DB in the context object that is provided to the error callback, with large or complex queries being able to get the path to the source SQL file and the values passed to it when running the query would be really helpful for debugging and monitoring purposes.

The proposed changes add the path to the query file and the values used to execute it to the EventContext.

[vitaly-t]

Sorry, I overlooked this PR in the last update, because such changes need tests + documentation updates, which you did not provide. I will look at it later.

[kremio]

No worries, and thanks for the feedback. I'll try and add a test and updates to the docs in the coming days.

[vitaly-t]

@kremio It's been 2 weeks since ;) Are you still planning to update it?

[kremio]

@vitaly-t A few days turned into a few weeks, but here are the updates to the tests and docs.