Revert "Add support for stacked sinks (#611)"

[saiharshavellanki]

This reverts commit 725eb40.

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Important

Reverts support for stacked sinks, removing related code, tests, and documentation, and updates version to 1.5.58.

• Behavior:
  • Reverts support for stacked sinks by removing stacked parameter from sink() in connectors.py.
  • Removes validation logic for stacked sinks in to_proto.py.
• Documentation:
  • Deletes sink.py example demonstrating stacked sinks.
  • Removes stacked option from sink.md and concepts/sink.md.
• Tests:
  • Removes tests related to stacked sinks in test_connectors.py and test_invalid_connectors.py.
• Misc:
  • Reverts version in pyproject.toml from 1.5.59 to 1.5.58.
  • Updates connector_pb2.py and connector_pb2.pyi to remove stacked field.

^{This description was created by for 9eec586. It will automatically update as commits are pushed.}

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