Bumped version to 0.21.0

[liuzicheng1987]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @liuzicheng1987, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request prepares the project for a new release by incrementing its version to 0.21.0. It significantly enhances dependency management by introducing configurable CSV and Parquet support within the Conan package, ensuring the correct integration of the Arrow library. Furthermore, the CMake build system has been refined to handle these dependencies more robustly, particularly when VCPKG is not utilized. The removal of an outdated pyproject.toml file also contributes to a cleaner and more focused project setup.

Highlights

• Version Bump: The project version has been updated from 0.20.0 to 0.21.0 across CMakeLists.txt and vcpkg.json.
• Conan Package Enhancements: The conanfile.py now includes new options, with_csv and with_parquet, which conditionally add arrow/21.0.0 as a dependency and map to corresponding CMake cache variables.
• CMake Dependency Linking Refinement: The CMakeLists.txt has been updated to provide conditional linking for Arrow and Parquet libraries, distinguishing between VCPKG and non-VCPKG usage to ensure correct dependency resolution.
• Project Tooling Cleanup: The pyproject.toml file, which was related to hatch environments and mkdocs, has been removed, indicating a potential streamlining or refactoring of project build/documentation configurations.

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[gemini-code-assist]

Code Review

This pull request bumps the project version to 0.21.0 and introduces support for CSV and Parquet formats. The changes correctly update version numbers across CMakeLists.txt and vcpkg.json, and add new options and dependencies to conanfile.py. However, there are several issues with the new dependency management for the Arrow library in both the CMake and Conan configurations. The current implementation will likely lead to linkage errors when building with CSV or Parquet support via Conan. My review provides specific suggestions to correct the library linkage in CMakeLists.txt and to properly configure the Arrow dependency in conanfile.py.