value strings: pretty printers for flags and enums

This adds zfs_valstr, a collection of pretty printers for bitfields and
enums. These are useful in debugging, logging and other display contexts
where raw values are difficult for the untrained (or even trained!) eye
to decipher.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>

include/sys/zio_impl.h

@@ -120,6 +120,9 @@ extern "C" {
 
 /*
  * zio pipeline stage definitions
+ *
+ * NOTE: PLEASE UPDATE THE BITFIELD STRINGS IN zfs_valstr.c IF YOU ADD ANOTHER
+ * FLAG.
  */
 enum zio_stage {
 	ZIO_STAGE_OPEN			= 1 << 0,	/* RWFCXT */