feat(ext/node): (partial) impl sqlite 'backup' function

[edilson258]

Towards #29439

This PR aims to implement the node:sqlite backup function

[Tango992]

nice

[edilson258]

Hi @littledivy

I'm trying to impl. the node:sqlite backup function.

Deno uses rusqlite lib under the hoods and it provides a backup function, so i decided to wrap it in an op and expose it to the js land

function provided by rusqlite

fn backup_db<P: AsRef<Path>>(
  src: &rusqlite::Connection,
  dst: P,
  progress: fn(rusqlite::backup::Progress),
 ) -> Result<()> { ... }

Node's backup function signature

async function backup(
  sourceDb: DatabaseSync,
  path: string,
  options?: BackupOptions,
): Promise<void>;

At this point i know that the rusqlite::Connection object needed by the rusqlite backup function is inside of sourceDb but i dont know how to pass it to rust op

[dsherret]

I think we'll need to add write permission checks here?

[edilson258]

judging by the signature

function backup(
  sourceDb: DatabaseSync,
  path: string | Buffer | URL,
  options?: BackupOptions,
): Promise<void>;

Since path can have different forms, we'll need to check diff permissions accordingly.

[edilson258]

I can't figure how to pass the progress call back function from js land to rust op. is there some code that i can inspire on??