Statically linking arrayfire

Right now arrayfire has to be used by linking to the DLL. Since the only parts of arrayfire that are included in the Rust bindings are BSD 3-clause, there should be no problem statically linking arrayfire. Is it possible that we could choose whether or not arrayfire is statically linked to ease distribution? Also, is there any downside to just always statically linking arrayfire? I feel like that would be more in-line with what the Rust community expects: adding a crate to your `Cargo.toml` should "just work".

從 Cargo.toml 整合與目前以 DLL 為基礎的 ArrayFire 連結設定開始。調查 Rust bindings 如何選擇與分發 native library，包括可選連結與一律靜態連結之間的取捨。當支援的連結選項及其分發影響已完成文件化並實作，或已明確界定範圍時，即視為完成。

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