Add DeleteFiles snapshot update API

[manuzhang]

Motivation

• Add the C++ equivalent of Iceberg Java's DeleteFiles API now that MergingSnapshotUpdate is available.

Description

• Add iceberg::DeleteFiles backed by MergingSnapshotUpdate with DeleteFile(path), DeleteFile(DataFile), DeleteFromRowFilter, CaseSensitive, and ValidateFilesExist.
• Expose NewDeleteFiles from Table and Transaction.
• Add CMake/Meson wiring and focused DeleteFiles tests.

Testing

• cmake --build build --target table_update_test
• ./build/src/iceberg/test/table_update_test '--gtest_filter=DeleteFilesTest.*'
• ./build/src/iceberg/test/table_update_test

[manuzhang]

@codex refer to https://github.com/apache/iceberg/blob/main/api/src/main/java/org/apache/iceberg/DeleteFiles.java

[chatgpt-codex-connector]

Summary

• Added API documentation above table::DeleteFiles to explicitly align C++ path-matching behavior with the Java DeleteFiles semantics referenced in the PR comment (exact metadata path matching; differently-normalized equivalent URIs are not treated as matches).
• Committed the change on branch work with commit 9f6b774ca53e412ade9d0a54e57aebea44609b67.
• Created a follow-up PR message via make_pr with title: “docs: align DeleteFiles semantics with Iceberg Java API reference”.

Testing

• ✅ git status --short
• ✅ git add src/iceberg/table_update.h && git commit -m "Clarify DeleteFiles path matching semantics"
• ✅ nl -ba src/iceberg/table_update.h | sed -n '606,628p'

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[manuzhang]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

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