Replaces all ad-hoc print() calls in the Slack gateway adapter with
proper logging.getLogger(__name__) calls, matching the pattern already
used by every other platform adapter (telegram, discord, whatsapp,
signal, homeassistant).
Changes:
- Add import logging + module-level logger
- Use logger.error for failures, logger.warning for non-critical
fallbacks, logger.info for status, logger.debug for routine ops
- Add exc_info=True for full stack traces on all error/warning paths
- Use %s format strings (lazy evaluation) instead of f-strings
- Wrap disconnect() in try/except for safety
- Add structured context (file paths, channel IDs, URLs) to log messages
- Convert document handling prints added after the original PR
Cherry-picked from PR #778 by aydnOktay, rebased onto current main
with conflict resolution and extended to cover document/video methods
added since the PR was created.
Co-authored-by: aydnOktay <xaydinoktay@gmail.com>