Add all read-only compatible features to GRUB2 compatibility feature set

Since GRUB2 opens pools in read-only mode, all read-only compatible
features can be enabled.

Several read-only compatible features have been introduced since the
GRUB2 compatibility file was created but the file wasn't updated.

I added all features from `zpool_feature_init()` in
`module/zcommon/zfeature_common.c` where the
`ZFEATURE_FLAG_READONLY_COMPAT` flag is set.

Signed-off-by: Luflosi <luflosi@luflosi.de>

cmd/zpool/compatibility.d/grub2

@@ -1,12 +1,24 @@
 # Features which are supported by GRUB2
+allocation_classes
 async_destroy
+block_cloning
 bookmarks
+device_rebuild
 embedded_data
 empty_bpobj
 enabled_txg
 extensible_dataset
 filesystem_limits
 hole_birth
 large_blocks
+livelist
+log_spacemap
 lz4_compress
+obsolete_counts
+project_quota
+resilver_defer
 spacemap_histogram
+spacemap_v2
+userobj_accounting
+zilsaxattr
+zpool_checkpoint

man/man7/zpool-features.7

@@ -219,17 +219,29 @@ to the end of the line is ignored.
 .Bd -literal -compact -offset 4n
 .No example# Nm cat Pa /usr/share/zfs/compatibility.d/grub2
 # Features which are supported by GRUB2
+allocation_classes
 async_destroy
+block_cloning
 bookmarks
+device_rebuild
 embedded_data
 empty_bpobj
 enabled_txg
 extensible_dataset
 filesystem_limits
 hole_birth
 large_blocks
+livelist
+log_spacemap
 lz4_compress
+obsolete_counts
+project_quota
+resilver_defer
 spacemap_histogram
+spacemap_v2
+userobj_accounting
+zilsaxattr
+zpool_checkpoint
 
 .No example# Nm zpool Cm create Fl o Sy compatibility Ns = Ns Ar grub2 Ar bootpool Ar vdev
 .Ed