v1.5.0

Read the padding some exporters leave after a delimiter.

New

• CsvConfig(skipInitialSpace: true) drops spaces sitting between a delimiter
  and the start of a field. RFC 4180 treats a space before a quote as content,
  so a, "b, c" is three fields by the letter of the spec; spreadsheets and
  several exporters read it as two. Off by default, so the strict reading stays
  the default. Only unquoted leading spaces are dropped: a space inside a quoted
  field, after the first character, or at the end of a field is still content.
• A comment marker reached only after skipped spaces is content rather than a
  comment, matching what the batch path already did with an indented marker.

All three decode paths honour it identically, and the new suite checks that on
every case by splitting the streaming input at every possible offset, so a run
of spaces crossing a chunk boundary is exercised rather than assumed.