Would postgresql add a pg_sleep_backend() method

Postgresql already pg_cancel_backend and pg_terminate_backend which will stop a backend.

Sometimes the system is busy (e.g. disk IO) for a long time, but I don’t want to stop each backend

If postgres has a sleep method, I may let some pid just sleep a few times, so disk busy may decend

and the most import backend may  run faster.

Backend1 -----disk busy 99%                                                        Backend1 -----disk busy 99%

Backend2 -----disk bush 99%      pg_sleep_backend(1, 10min)     Backend2 -----disk busy 0%

Backend3 -----disk bush 99%      pg_sleep_backend(1, 11min)     Backend3 -----disk busy 0%

Backend4 -----disk bush 99%      pg_sleep_backend(1, 12min)     Backend4 -----disk busy 0%

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