* add language version 2.8 in packages/flutter

* enable non-nullable analyzer flag

* combine forwardStandardStreams

* combine exec and eval

The original help info has lines too long for
appropriate terminal display.

This reverts commit dca6320f.

The tool was setting the output preferences in a sub-context. Originally these were not injected before the arg parsers were created, though that was fixed by the lazy command creation. Once local engine is removed, the inner flutter_command Zone can be removed.

Remove global Platfrom from proxy validator. move tests to new file, and update asserts to cover message contents.

[flutter_tools] create NotifyingLogger at the top level when running flutter run --machine or flutter attach --machine (#59087)

Removes dependency on injecting additional logger with zones

Support Microsoft Edge as a device for flutter run when web is enabled. Currently this only works on Windows, and does not include a validator for edge.

Fixes #55322

This prevents using a cached kernel file with different defines, since --initialize-from-dill does not handle this correctly.

Fixes #58976

Adds support for --bundle-sksl-path to windows, linux, macOS, and iOS.

Fixes #53115

flutter analyze was unconditionally using the cached dart-sdk for analysis, and was not running with the built SDK during local engine. This broke when trying to update the analyzer for null safety, since it required us to wait for the dart change to roll into the framework first.

This reverts commit 9ed3e5be.

flutter analyze was unconditionally using the cached dart-sdk for analysis, and was not running with the built SDK during local engine. This broke when trying to update the analyzer for null safety, since it required us to wait for the dart change to roll into the framework first.

As of flutter.dev/go/engine-cpu-profiling, we collect the CPU and
Memory usage. With work being done to collect GPU usage on iOS as well.

This adds them to the timeline summary.

Fixes: https://github.com/flutter/flutter/issues/58803