fix: optimize reconnect exception for IoTDB Python Client

[Alchuang22-dev]

Description

IoTDB would only try to reconnect only when network exception occured, and 801/822 error would not trigger useless reconnection.

Content1

Divide Exception into TTransport.TTransportException and IoTDBConnectionException

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This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods.
• added or updated version, license, or notice information
• added comments explaining the "why" and the intent of the code wherever would not be obvious
  for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold
  for code coverage.
• added integration tests.
• been tested in a test IoTDB cluster.

[CRZbulabula]

LGTM!!!

[Copilot]

Pull request overview

This PR adjusts the IoTDB Python client’s session open/reconnect behavior so that reconnect attempts are only triggered for transport/network failures, while IoTDB server status errors (e.g., authentication/account-blocked) fail fast without retrying.

Changes:

• Narrow Session.open() reconnect-triggering exceptions to IoTDBConnectionException (instead of all Exception).
• Refine init_connection() exception handling to wrap only TTransport.TTransportException as IoTDBConnectionException, while re-raising other exceptions after closing the transport.
• Add unit tests to verify “no retry on TSStatus errors (801/822)” and “retry on transport errors”.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
iotdb-client/client-py/iotdb/Session.py	Limits reconnect logic to connection-level failures and ensures transport is closed on non-connection exceptions.
iotdb-client/client-py/tests/unit/test_session_connection.py	Adds unit coverage validating retry vs. no-retry behavior for transport exceptions vs. IoTDB status errors.

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