feat: download preview releases

[murfffi]

Closes #4

[gemini-code-assist]

Summary of Changes

Hello @murfffi, 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 introduces a significant enhancement by enabling the system to download and correctly process preview releases of DuckDB. This involves a refactoring of the existing download mechanism to distinguish between stable and preview versions, directing preview downloads to a dedicated artifact server, and implementing specialized logic to handle the nested archive format characteristic of these early access builds. The change broadens the utility of the download functionality, allowing for integration with the latest development iterations of DuckDB.

Highlights

• Preview Release Support: Added the capability to download and process "preview" versions of DuckDB binaries.
• Nested Archive Handling: Implemented specific logic to handle the double-zipped structure often found in DuckDB preview releases, extracting an inner zip before the final binary.
• Modular Download Logic: Refactored the core download functions to dynamically select the correct download URL and extraction method based on whether a standard or preview version is requested.

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[gemini-code-assist]

Code Review

This pull request adds the capability to download preview releases of DuckDB. The implementation is well-structured, separating the logic for preview releases into new functions and a new file. My review includes suggestions to improve robustness by handling unexpected cases, enhance error reporting for better debuggability, and refine the .gitignore configuration to be more comprehensive.