add an option to skip file splitting when bulkload hfiles

When bulkload hfiles, if the key range of the hfile does not match the key range of the region, the BulkLoadHFilesTool will split hfile to fit make the key range of the new file match the key range of the region. If there are many files to be split, the load on the BulkLoadHFilesTool will be very high. Sometimes we want to avoid this situation, just directly fail and regenerate new hfiles. Here we try to introduce a new option, When the above problem is encountered, an exception will be thrown and let the upper client handle it.