fix: build delete filters with PyIceberg expressions

[konstantinoscs]

What this does

This PR replaces Tower's fragile PyArrow-filter string parser with native PyIceberg expressions.

Users can now write filters such as:

table.delete(
    (table.column("age") >= 18)
    & (table.column("status") != "inactive")
)

SQL-like strings and native PyIceberg expressions remain supported. Old PyArrow expressions now raise a clear migration error before any write credentials are requested.

Why

The previous implementation tried to understand a filter by parsing its rendered text. That could misread column names or values containing words such as and, or, or not. Building the expression structurally avoids those errors.

S3 Tables and BYO catalog selection and credentials are unchanged.

Testing

Tests cover every comparison operator, logical composition and inversion, nested fields, unusual identifiers and values, and the PyArrow migration error.

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