Polling: handle metadata and name changes

[passcod]

From the PollWatcher code:

• Populate mtimes before loop, and then handle creation events (done in Normalize the recursive watch behavior of the various back-ends #88, released in v3.0.0)
• Handle deletion events (done in Normalize the recursive watch behavior of the various back-ends #88, released in v3.0.0)
• Handle chmod events
• Handle renames

[passcod]

The first two (the work done in #88), have been released in 3.0.0.

[dhiemaz]

@passcod, this issue solved yet?

[passcod]

Nope: https://github.com/notify-rs/notify/blob/main/src/poll.rs#L59-L60