Implement notifications_iter for async connections

[LucaCappelletti94]

At this time, the notifications_iter method is solely available for the sync connections. Would it be possible to implement it also for the async case?

[weiznich]

It is certainly possible to implement an async equivalent of that method. I personally do not have the time to do that in a timely manner, but I might accept a PR for that.

[lsunsi]

@weiznich Can you point the function again? I think the reference got stale since it points to no function (or maybe lookup_type, which would be weird).

I'm also interested in this feature so I might take a shot at it!

[weiznich]

That link refereed to the drive_connection function:

diesel_async/src/pg/mod.rs

Line 971 in 0e703ba

fn drive_connection<S>(

[lsunsi]

Awesome. I'm getting somewhere here in a fork but I have a couple doubts, do you mind if I open a draft pull request with some questions so you can give me some pointers? I'm asking before opening because I know you're busy and I don't want to be a burden.

[weiznich]

Opening a draft PR and adding questions there is a good way to approach that.

[lsunsi]

Awesome, we'll move this conversation there then. Thanks! #251