Truncate checkpoint when final connection drops to match sqlite behavior

[PThorpe92]

Someone noticed they have an 8GB WAL file after using turso in a daemon which is constantly restarted. SQLite will truncate checkpoint the log automatically when the final connection to a database drops. We do this currently, but only when close is explicitly called.

Otherwise this is quite problematic because we read the entire WAL into the frame cache on startup every time.

[Pavan-Nambi]

I think, this closes #3729, haven't checked locally but from pr description. or i misunderstood this - in that case, ignore this.

[jussisaurio]

I reran Test bindings on browser since it had timed out, and it still timed out -- perhaps this branch has a real issue related to browser specifically?

[jussisaurio]

Browser bindings test is timing out, even after re-running them