zinject: Introduce ready delay fault injection

This adds a pause to the ZIO pipeline in the ready stage for
matching I/O (data, dnode, or raw bookmark).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Akash B <akash-b@hpe.com>
Signed-off-by: Robert Evans <evansr@google.com>
Closes #17787

include/sys/zfs_ioctl.h

@@ -455,6 +455,7 @@ typedef enum zinject_type {
 	ZINJECT_DECRYPT_FAULT,
 	ZINJECT_DELAY_IMPORT,
 	ZINJECT_DELAY_EXPORT,
+	ZINJECT_DELAY_READY,
 } zinject_type_t;
 
 typedef enum zinject_iotype {