Use ControlFlow for IDLE callback return type
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- Rust
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Description
The [the `ControlFlow` type](https://github.com/scottmcm/rfcs/blob/do-or-do-not/text/0000-try-trait-v2.md#opscontrolflow) might be nicer than the `bool` type as a return for the IDLE callbacks. If / when the type is stabilized have a look at implementing it there.
_Originally posted by @jonhoo in https://github.com/jonhoo/rust-imap/issues/186#issuecomment-820092526_
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