FlutterDriver: deprecate enableAccessibility; redirect it to setSemantics; add setSemantics tests (#82939)

* deprecate enableAccessibility; redirect it to setSemantics
Co-authored-by: David Iglesias <ditman@gmail.com>

This reverts commit 9fd5242e.

* One more reland of "Driver vm service (#68654)" (#69074)" (#69077)" (#69089)"

This reverts commit e5814756.

* pub run test

This reverts commit 05ab0eba.

This reverts commit 19ce7a86.

This reverts commit 3ecac303.
Co-authored-by: Dan Field <dfield@gmail.com>

Migrate flutter_driver to use package:vm_service

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.

This reverts commit ccd4f6dd.

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

* Add punctuation for unterminated sentences in doc comments

* Addressing review nit

This reverts commit 5fa5701d.

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

Work-around large timeline data killing devicelab machines by requesting data in 1 second intervals and combining at the end. Non-breaking change to the driver API.