Implements sorting for bd list by various fields including priority,
created, updated, closed, status, id, title, type, and assignee.
Features:
- --sort flag accepts field name to sort by
- --reverse/-r flag reverses the sort order
- Default sort orders optimized for common usage:
- priority: ascending (P0 first)
- dates: descending (newest first)
- text fields: ascending (alphabetical)
Resolves bd-22g
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Co-Authored-By: Claude <noreply@anthropic.com>