build(deps): upgrade datafusion, arrow, and other deps

[xushiyan]

Description

Upgrade:

• Datafusion
• Arrow
• PyO3
• Rust lang
• and others

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[Copilot]

Pull request overview

This PR upgrades major dependencies including DataFusion (46.0.0 → 51.0.0), Arrow (54.2.0 → 57.1.0), PyO3 (0.23 → 0.26), and several other dependencies. It also updates the Rust toolchain version and makes necessary API adaptations for the upgraded libraries.

Key Changes

• Upgraded DataFusion from 46.0.0 to 51.0.0 and Arrow from 54.2.0 to 57.1.0, with corresponding API changes for FileScanConfig builder pattern and Expr::Literal variants
• Upgraded PyO3 from 0.23 to 0.26, migrating return types from PyObject to Py<PyAny> with .unbind() pattern
• Updated Rust toolchain to version 1.88 and adjusted type signatures (e.g., usize to u64 for file sizes)

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rust-toolchain.toml	Updates Rust toolchain channel from 1.87 to 1.88
Cargo.toml	Updates rust-version and upgrades arrow, datafusion, object_store, prost, bytes, chrono, strum, and url dependencies
python/Cargo.toml	Upgrades pyo3 dependency from ~0.23 to ~0.26
python/src/internal.rs	Adapts Python bindings for PyO3 0.26: changes return types from PyObject to Py<PyAny>, adds .unbind() calls, and updates base_file_size from usize to u64
crates/datafusion/src/lib.rs	Adapts to DataFusion 51.0.0 API: uses FileScanConfigBuilder instead of FileScanConfig::new(), updates Expr::Literal pattern matching, adds crypto field, and converts to FileGroup type
crates/datafusion/src/util/expr.rs	Updates Expr::Literal pattern matching to include second parameter
crates/core/src/storage/mod.rs	Updates ParquetObjectReader::new() API to accept obj_path instead of obj_meta and chain with .with_file_size()
crates/core/src/storage/file_metadata.rs	Changes size field type from usize to u64 for compatibility with object_store API
crates/core/src/avro_to_arrow/schema.rs	Adds support for new Arrow decimal types: Decimal32 and Decimal64

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[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.63%. Comparing base (72b376e) to head (6724907).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/datafusion/src/util/expr.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #504   +/-   ##
=======================================
  Coverage   87.62%   87.63%           
=======================================
  Files          65       65           
  Lines        4106     4109    +3     
=======================================
+ Hits         3598     3601    +3     
  Misses        508      508           

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