draft: Make iterate() lazy in JavaScript API

[diegoreis42]

Aims to solve #514

I'm marking this PR as a draft because I encountered an issue while trying to create a sqlite3 statement from a wasm statement.

In the wasm context, the limbo_core::Statement is wrapped in a RefCell, which makes it difficult to create a sqlite3 statement without transferring ownership. After some research, I found that in order to pass a reference to the Statement (instead of transferring ownership), I would need to modify the stmt signature in the sqlite3_stmt struct. This change would lead to further modifications beyond the scope of the current issue.

I’m not sure if this is a skill issue or if I’m missing something, but I’d appreciate any help or suggestions on how to resolve this problem.

[penberg]

@diegoreis42 Perhaps the issue was not exact enough, but you should not import the sqlite3 crate (it's a thin wrapper to provide a C API). Instead, you should just use Rows::next_row() from core (which internally calls Statement::step().