public static File producerSnapshotFile(File logDir, long offset) {
        return new File(logDir, filenamePrefixFromOffset(offset) + PRODUCER_SNAPSHOT_FILE_SUFFIX);
    }
Returns a File instance with parent directory as logDir and the file name as producer snapshot file for the
given offset.

@param logDir The directory in which the log will reside
@param offset The last offset (exclusive) included in the snapshot
@return a File instance for producer snapshot.
storage/src/main/java/org/apache/kafka/storage/internals/log/LogFileUtils.java