Add package-private extension type Event on FileSystemEvent.

[davidmorgan]

The SDK FileSystemEvent type is confusing in how it handles isDirectory: for the FileSystemDeleteEvent subclass it always returns false, even if you explicitly pass true to the constructor. Some watcher code is currently passing true to the constructor as if it will do something.

So while it initially looks like there are eight types of event (create file, create directory, modify file, modify directory, remove file, remove directory, move file, move directory) there are actually only seven.

Create an extension type around FileSystemEvent that makes this clear, use it everywhere. Use an event type enum with seven entries instead of four entries + a boolean, so as not to have to deal with the unrepresentable "delete directory".

No behavior changes :)

Other cleanup:

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".

Windows watcher only gets a "modify directory" event from the OS alongside "directory created" or "directory deleted", and was being ignored: make it clearer that it's ignored by ignoring sooner.

Update doc for Windows _sortEvents which says it removes "move" events, it does not(!).

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:benchmark_harness	2.4.0-wip	WIP (no publish necessary)
package:boolean_selector	2.1.2	already published at pub.dev
package:browser_launcher	1.1.3	already published at pub.dev
package:cli_config	0.2.1-wip	WIP (no publish necessary)
package:cli_util	0.5.0-wip	WIP (no publish necessary)
package:clock	1.1.3-wip	WIP (no publish necessary)
package:code_builder	4.11.0	already published at pub.dev
package:coverage	1.15.0	already published at pub.dev
package:csslib	1.0.2	already published at pub.dev
package:extension_discovery	2.1.0	already published at pub.dev
package:file	7.0.2-wip	WIP (no publish necessary)
package:file_testing	3.1.0-wip	WIP (no publish necessary)
package:glob	2.1.3	already published at pub.dev
package:graphs	2.3.3-wip	WIP (no publish necessary)
package:html	0.15.6	already published at pub.dev
package:io	1.1.0-wip	WIP (no publish necessary)
package:json_rpc_2	4.0.0	already published at pub.dev
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package:mime	2.0.0	already published at pub.dev
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package:package_config	2.3.0-wip	WIP (no publish necessary)
package:pool	1.5.2	already published at pub.dev
package:process	5.0.5	already published at pub.dev
package:pub_semver	2.2.0	already published at pub.dev
package:pubspec_parse	1.5.0	already published at pub.dev
package:source_map_stack_trace	2.1.3-wip	WIP (no publish necessary)
package:source_maps	0.10.14-wip	WIP (no publish necessary)
package:source_span	1.10.1	already published at pub.dev
package:sse	4.1.8	already published at pub.dev
package:stack_trace	1.12.1	already published at pub.dev
package:stream_channel	2.1.4	already published at pub.dev
package:stream_transform	2.1.2-wip	WIP (no publish necessary)
package:string_scanner	1.4.1	already published at pub.dev
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package:test_reflective_loader	0.4.0	already published at pub.dev
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package:unified_analytics	8.0.6	ready to publish	unified_analytics-v8.0.6
package:watcher	1.1.5-wip	WIP (no publish necessary)
package:yaml	3.1.3	already published at pub.dev
package:yaml_edit	2.2.2	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
watcher	None	1.1.4	1.1.5-wip	1.1.4	✔️

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Coverage ⚠️

File	Coverage
pkgs/watcher/lib/src/directory_watcher/linux.dart	💔 91 % ⬇️ 1 %
pkgs/watcher/lib/src/directory_watcher/mac_os.dart	💔 0 % ⬇️ NaN %
pkgs/watcher/lib/src/directory_watcher/windows.dart	💔 0 % ⬇️ NaN %
pkgs/watcher/lib/src/event.dart	💚 58 %
pkgs/watcher/lib/src/file_watcher/native.dart	💚 83 % ⬆️ 3 %
pkgs/watcher/lib/src/utils.dart	💚 83 %

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pkgs/bazel_worker/benchmark/benchmark.dart
pkgs/benchmark_harness/integration_test/perf_benchmark_test.dart
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pkgs/clock/lib/src/stopwatch.dart
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pkgs/html/lib/src/constants.dart
pkgs/html/lib/src/encoding_parser.dart
pkgs/html/lib/src/html_input_stream.dart
pkgs/html/lib/src/list_proxy.dart
pkgs/html/lib/src/query_selector.dart
pkgs/html/lib/src/token.dart
pkgs/html/lib/src/tokenizer.dart
pkgs/html/lib/src/treebuilder.dart
pkgs/html/lib/src/utils.dart
pkgs/html/test/dom_test.dart
pkgs/html/test/parser_feature_test.dart
pkgs/html/test/parser_test.dart
pkgs/html/test/query_selector_test.dart
pkgs/html/test/selectors/level1_baseline_test.dart
pkgs/html/test/selectors/level1_lib.dart
pkgs/html/test/selectors/selectors.dart
pkgs/html/test/support.dart
pkgs/html/test/tokenizer_test.dart
pkgs/html/test/trie_test.dart
pkgs/html/tool/generate_trie.dart
pkgs/pubspec_parse/test/git_uri_test.dart
pkgs/stack_trace/example/example.dart
pkgs/watcher/test/custom_watcher_factory_test.dart
pkgs/yaml_edit/example/example.dart

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