Add support for runtime arguments in injection points

The macros INJECTION_POINT() and INJECTION_POINT_CACHED() are extended
with an optional argument that can be passed down to the callback
attached when an injection point is run, giving to callbacks the
possibility to manipulate a stack state given by the caller.  The
existing callbacks in modules injection_points and test_aio have their
declarations adjusted based on that.

da7226993f (core AIO infrastructure) and 93bc3d75d8 (test_aio) and
been relying on a set of workarounds where a static variable called
pgaio_inj_cur_handle is used as runtime argument in the injection point
callbacks used by the AIO tests, in combination with a TRY/CATCH block
to reset the argument value.  The infrastructure introduced in this
commit will be reused for the AIO tests, simplifying them.

Reviewed-by: Greg Burd <greg@burd.me>
Discussion: https://postgr.es/m/Z_y9TtnXubvYAApS@paquier.xyz

src/backend/access/transam/xlog.c

@@ -7882,7 +7882,7 @@ CreateRestartPoint(int flags)
 	 * This location needs to be after CheckPointGuts() to ensure that some
 	 * work has already happened during this checkpoint.
 	 */
-	INJECTION_POINT("create-restart-point");
+	INJECTION_POINT("create-restart-point", NULL);
 
 	/*
 	 * Remember the prior checkpoint's redo ptr for