Access hypertable and chunk information

• View chunk or hypertable information:

  PageLoad.chunks.count
  PageLoad.hypertable.detailed_size

• Compress/Decompress chunks:

  PageLoad.chunks.uncompressed.first.compress!  # Compress the first uncompressed chunk
  PageLoad.chunks.compressed.first.decompress!  # Decompress the oldest chunk
  PageLoad.hypertable.compression_stats # View compression stats