Add compatibility file openzfs macOS 2.1.6 (openzfs#116)

Add a compatibility file for the openzfs macOS 2.1.6 release

cmd/zpool/compatibility.d/openzfs-2.1.6-macOS

@@ -0,0 +1,38 @@
+# Features supported by OpenZFS 2.1.6 on macOS
+allocation_classes
+async_destroy
+bookmark_v2
+bookmark_written
+bookmarks
+device_rebuild
+device_removal
+draid
+edonr
+embedded_data
+empty_bpobj
+enabled_txg
+encryption
+extensible_dataset
+filesystem_limits
+hole_birth
+large_blocks
+large_dnode
+livelist
+log_spacemap
+lz4_compress
+multi_vdev_crash_dump
+obsolete_counts
+project_quota
+redacted_datasets
+redaction_bookmarks
+resilver_defer
+sha512
+skein
+spacemap_histogram
+spacemap_v2
+userobj_accounting
+zpool_checkpoint
+zstd_compress
+zilsaxattr
+head_errlog
+blake3