Python bindings missing scanner projection support

[fresh-borzoni]

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• I searched in the issues and found nothing similar.

Motivation

Add column projection support for better performance and more Pythonic API than C++ bindings.

Methods to Add

1. By index (C++ parity)

scanner = table.new_log_scanner_with_projection([0, 2, 4])

2. By name (Python-specific, more idiomatic)

  scanner = table.new_log_scanner_with_column_names(["id", "name", "email"])

Python users expect to work with column names, not indices.
This goes beyond C++ parity for better ergonomics.

Solution

Implement them :)

Anything else?

No response

Willingness to contribute

• I'm willing to submit a PR!