[PATCH] Add schema and table names to partition error

Hello,

I'm writing telemetry data into a table partitioned by time. When there
is no partition for a particular date, my app notices the constraint
violation, creates the partition, and retries the insert.

I'm used to handling constraint violations by observing the constraint
name in the error fields. However, this error had none. I set out to add
the name to the error field, but after a bit of reading my impression is
that partition constraints are more like a property of a table.

I've attached a patch that adds the schema and table name fields to
errors for my use case:

- Insert data into a partitioned table for which there is no partition.
- Insert data directly into an incorrect partition.

Thanks,
Chris