Move range_tree, btree, highbit64 to common code

Break out the range_tree, btree, and highbit64/lowbit64 code from kernel
space into shared kernel and userspace code.  This is needed for the
updated `zpool status -vv` error byte range reporting that will be
coming in a future commit.  That commit needs the range_tree code in
kernel and userspace.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #18133

cmd/zdb/Makefile.am

@@ -14,6 +14,8 @@ zdb_LDADD = \
 	libzdb.la \
 	libzpool.la \
 	libzfs_core.la \
-	libnvpair.la
+	libnvpair.la \
+	libbtree.la \
+	librange_tree.la
 
 zdb_LDADD += $(LIBCRYPTO_LIBS)