Reland "Flutter Driver - Create widget finders from serialized finders extensions" with null safety (#67711)

* Flutter Driver - Create widget finders from serialized finders extensions

Revert "Flutter Driver - Create widget finders from serialized finders extensions (#67456)" (#67687)

This reverts commit 74f6fa45.

This reverts commit d4112424.

Reland: #67155

Fixes analysis error caused by landing of material migration, and g3 error caused by moving of fuchsia lib.

This reverts commit e826442e.

Ensures all of the libraries that the application side code import are migrated to null safety. full null safety migration is blocked by json rpc 2 and a breaking change to vm service client.

Expose GestureBinding.handlePointerEvent, replacing dispatchEvent as the preferred way to dispatch events (#64846)

This reverts commit 33f79950.

* fuchsia_remote_debug_protocol allows open port on remote device

Allows defining a port forwarding function for which the accessible
port is not on the host device. Examples include tunneling solutions
where a tunneling program on the same device as the Dart VM exposes
an open port through which it tunnels connections to the VM.

* Move ssh-specific comment to SshPortForwarder

This reverts commit ccd4f6dd.

Allow Developers to enable Accessibility testing on WebFlutterDriver and get the underlying webDriver (#65051)

This reverts commit db4dda20.

* Add punctuation for unterminated sentences in doc comments

* Addressing review nit

This reverts commit 5fa5701d.

Category isn't preserved by timeline events as `Dart_TimelineEvent`
specifies the category as `embedder`.

Fixes: https://github.com/flutter/flutter/issues/60008

When `retainPriorEvents` is passed as true, the current behavior still limits timeline events to the timestamp after `traceEvents` is called. This can cause startup events to be missing.

This fixes it by passing null to `stopTracingAndDownloadTimeline` for the start and end time.

Related: #58430

Re-land "Deprecate WhitelistingTextInputFormatter and BlacklistingTextInputFormatter (#59120)" (#59876)

This relands #59120, which was reverted in #59870.

Revert "Deprecate WhitelistingTextInputFormatter and BlacklistingTextInputFormatter (#59120)" (#59870)

This reverts commit 8665e138.

* Add comments to flutter_driver for timeline class

Mostly about explanation for the json items from
timeline.dart and timeline_summary.dart.

[Flutter Driver] Update the comments regarding the default timeout of WaitFor and WaitForAbsent commands (#58771)

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