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Two backend routines are added to allow extension to allocate and define custom wait events, all of these being allocated in the type "Extension": * WaitEventExtensionNew(), that allocates a wait event ID computed from a counter in shared memory. * WaitEventExtensionRegisterName(), to associate a custom string to the wait event ID allocated. Note that this includes an example of how to use this new facility in worker_spi with tests in TAP for various scenarios, and some documentation about how to use them. Any code in the tree that currently uses WAIT_EVENT_EXTENSION could switch to this new facility to define custom wait events. This is left as work for future patches. Author: Masahiro Ikeda Reviewed-by: Andres Freund, Michael Paquier, Tristan Partin, Bharath Rupireddy Discussion: https://postgr.es/m/b9f5411acda0cf15c8fbb767702ff43e@oss.nttdata.com