Use Event extension type for MacOS DirectoryWatcher.

[davidmorgan]

Use the new Event extension type that makes it clear that delete events don't set isDirectory.

Simplify _canonicalEvent, removes don't specify isDirectory so those always conflict, it's only file add and file modify that can be reduced to a single "create" event.

MacOS watcher never receives move events or "modify directory" events from the OS, make this clear: assert(false) and drop the event if such an event is received, so tests will catch it and if it happens in the wild we use the code tested with no such events.

Clean up MacOS watcher _sortEvents because it can't receive directory move or "modify directory".

No behavior changes.

Test failures on MacOS on dev SDK are unrelated, they are due to an SDK issue dart-lang/sdk#61693

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Package	Version	Status	Publish tag (post-merge)
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package:boolean_selector	2.1.2	already published at pub.dev
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Breaking changes ✔️

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pkgs/watcher/lib/src/directory_watcher/linux.dart	💚 92 %
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