Add blocking poll similar to C++ bindings into python bindings

[fresh-borzoni]

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Description

Add a poll() method to the Python LogScanner API to enable incremental, timeout-based record reading, similar to the C++ bindings.

Current situation:

• Python bindings only support scan() which blocks until all records are fetched
• No way to do incremental polling for real-time data consumption

Proposed addition:

  # Poll with timeout (milliseconds)
  result = log_scanner.poll(timeout_ms=5000)

  # Returns PyArrow Table with records (or empty table on timeout)
  if result.num_rows > 0:
      df = result.to_pandas()
      # Process data...

Benefits:

• Enables real-time streaming patterns
• Better control over blocking behavior
• Consistency with C++ API surface

Willingness to contribute

• I'm willing to submit a PR!