0.10.0

Release notes

Enhancements

• Added start and end getters to Metadata that return time::OffsetDateTime
• Added symbol_map and symbol_map_for_date methods to Metadata to aid historical
  symbology mapping from the instrument IDs in records
• Added DynReader struct for being agnostic about whether an input stream is
  zstd-compressed
• Improved safety of RecordRef::get by adding length check
• Added Python DBN Transcoder class for converting DBN to JSON and CSV with optional
  zstd compression
• Added optional has_metadata parameter to Python DBNDecoder to allow
  decoding plain records by passing False. By default DBNDecoder expects a complete
  DBN stream, which begins with metadata
• Added get_ref methods to dbn::Decoder and dbn::RecordDecoder which return a
  reference to the inner reader
• Added UNDEF_PRICE, UNDEF_ORDER_SIZE, UNDEF_STAT_QUANTITY, and UNDEF_TIMESTAMP
  constants to databento_dbn Python package to make it easier to filter null values
• Added Metadata::builder() function to create a new builder instance

Breaking changes

• Split out EncodeRecordRef trait from EncodeDbn to have a boxable trait (i.e.
  Box<dyn EncodeRecordRef>) for dynamic encoding
• Split out EncodeRecord trait from EncodeDbn
• Split out DecodeRecordRef trait from DecodeDbn to have a boxable trait (i.e.
  Box<dyn DecodeRecordRef>) for dynamic decoding
• Changed DynWriter from an enum to a struct with only private fields

Bug fixes

• Fixed typo in BATY.PITCH.BATY publisher
• Fixed typo in README.md (credit: @thomas-k-cameron)