To increase schema security we do not want to mix our own internal
objects with user objects. Since chunks are created in the
_timescaledb_internal schema our internal functions should live in
a different dedicated schema. This patch make the necessary
adjustments for the following functions:
- restart_background_workers()
- stop_background_workers()
- start_background_workers()
- alter_job_set_hypertable_id(integer,regclass)
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