add 'dataTypeModifiedAndCannotUseStatistics'

[shuwenwei]

Purpose

• Ensure the "data type modified" state that prevents using statistics is propagated from time series metadata down to chunk metadata and is considered when deciding whether metadata is "modified".
• Fix lost/ignored data-type-modified information when metadata is copied or passed down, so downstream consumers correctly treat metadata as modified when statistics cannot be used.

What changed

• Added a new boolean field dataTypeModifiedAndCannotUseStatistics to:
  • TimeseriesMetadata
  • ChunkMetadata
• Added accessor/mutator methods for the new flag to:
  • ITimeSeriesMetadata (interface)
  • IChunkMetadata (interface)
• Implemented propagation and usage:
  • TimeseriesMetadata.getCopiedChunkMetadataList now copies the dataTypeModifiedAndCannotUseStatistics flag into copied ChunkMetadata instances.
  • TimeseriesMetadata.isModified and ChunkMetadata.isModified now return true if either the existing modified flag or dataTypeModifiedAndCannotUseStatistics is true.
  • ChunkMetadata.setDataTypeModifiedAndCannotUseStatistics and TimeseriesMetadata.setDataTypeModifiedAndCannotUseStatistics use |= semantics to accumulate the flag (preserve any previous true).
  • AbstractAlignedChunkMetadata and AbstractAlignedTimeSeriesMetadata delegate the new getter/setter to their underlying time/timeseries metadata objects so aligned metadata also exposes and propagates the flag.