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

Fix the `character` field of the `RawKeyEvent` to hold correct data on non-Android platforms. (#65667)

This fixes a problem where the character field of the RawKeyEvent was not being set at all for non-Android platforms.

I also updated the key maps, and corrected a problem with the Windows key map where the backquote character wasn't correctly mapped.

fix an issues where raw json output was written to IDE clients

Revert "Add CompositedTransformFollower.{followerAnchor, leaderAnchor} for custom anchoring (#64930)" (#65871)

This reverts commit 2fbb529d.

This follows https://github.com/flutter/flutter/pull/59364 and cl/319911104

FittedBox is still default to hardEdge clip as new FittedBox is added to Google very quickly. Let's first roll other part of changes into Google first.

Generates version.json in web directory of project. version.json can be used in the future version of package_info which will support web. version.json has the following keys : app_name, version and build_number. This file is generated every time a user runs or builds the project.
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

This would help us investigate issues like
https://github.com/flutter/flutter/issues/64781

Like the ProcessException thrown from zip running on a bad file, the tool should catch the ArchiveException thrown from windows implementation using package:archive.

Port the deprecated settings devicelab test to tool integration shard. Tests that apps can be built using the deprecated android/settings.gradle file.

Part of #65790

[Material] Fix a jumping animation in the beginning of the extended Navigation Rail transition (#65659)

* Reland "Nnbd widgets (#64672)"

This reverts commit 127e6790.

* remove non-nullable enforcement on AsyncSnapshot

* make data param non-nullable for AsyncSnapshot.withData

* make some Text params non-nullable