Auto-drop borrows

In https://github.com/bytecodealliance/jco/pull/262, we now validate all borrows properly.

The need to call `resource[Symbol.dispose]()` explicitly for all functions that take resources seems unnecessary though.

Rather, the implementation should always auto-drop borrows at the bindgen level without requiring the JS user to have to do that explicitly. Explicitly drop calls should instead act as early drops if desired.

先閱讀 PR 262 以及它修改的 bindgen 實作，因為該 issue 沒有指出任何檔案或測試。追蹤借用資源如何被驗證及丟棄，然後將完成定義為對取得資源的函式自動丟棄借用，同時顯式的 Symbol.dispose() 呼叫仍可作為提前丟棄的方式使用。

由索引模型根據 Issue 內容生成。