Test and validate BinaryBuilder recipe for prebuilt binaries

[jhamman]

Summary

A BinaryBuilder recipe exists (referenced in the build infrastructure) but it's unclear whether it has been tested end-to-end for producing cross-platform prebuilt binaries. Currently, users must have a Rust toolchain installed to build from source.

Prebuilt binaries via BinaryBuilder.jl would:

• Remove the Rust toolchain requirement for end users
• Enable Pkg.add("Zarrs") to "just work" on all platforms
• Be a prerequisite for smooth General registry registration (Register Zarrs.jl in Julia General registry #4)

Tasks

• Verify the BinaryBuilder recipe compiles zarrs_jl for all target platforms (Linux x86_64/aarch64, macOS x86_64/aarch64, Windows x86_64)
• Test that the resulting JLL package loads correctly on each platform
• Ensure Icechunk feature is included in the prebuilt binary
• Submit the recipe to Yggdrasil for hosting
• Update deps/build.jl to prefer prebuilt binaries when available, falling back to source build

Notes

• The cdylib crate type and Rust LTO (lto = true in release profile) may require special handling in BinaryBuilder
• Cross-compilation of Rust with rustls-tls should work but needs verification
• The Icechunk dependency pulls in additional native code that may complicate cross-compilation

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