wboayue / rust-ibapi / 24182397692

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fix: improve error context for parsing failures (#440)

* fix(messages): improve error context for parsing failures

- Wrap parse() calls in next_date_time() with Error::Parse to include field index and value
- Fix parse_unix_timestamp() to provide error context instead of generic ParseIntError
- Fix parse_bar_date() to provide error context instead of generic ParseIntError

This changes error messages from:
  'invalid digit found in string'
to:
  'parse error: <field_index> - <field_value> - <parse_error>'

Making it much easier to debug which IBKR message field is causing parsing issues.

Fixes issues where symbols like GOOGL, BTC, QCOM fail during subscription with
opaque 'invalid digit found in string' errors.

* test: add coverage for parse_bar_date and parse_unix_timestamp

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Co-authored-by: Wil Boayue <wil.boayue@gmail.com>

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