io: add pyiceberg-core scan adapters#1
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Stack position: PyIceberg PR after pyiceberg-core schema/expression/file_io/scan bindings are available (ABA-156/157).
Adds internal adapters from PyIceberg Schema, FileIO, BooleanExpression, delete files, and FileScanTask into the pyiceberg_core binding surface. This does not wire DataScan yet. It is deliberately conservative: equality deletes are rejected, partitioned tasks require partition spec metadata, old pyiceberg-core wheels are feature-gated, and residual filter fields are included in read projection decisions.
Validation:
Challenger loop: red-team findings on fake surface, residual projection, partition metadata, equality deletes, and old-wheel behavior were addressed; final review green.