No code changes, just comments: I spell-checked all the comments in the repo.

* WIP on web plugin registry

* WIP on registering plugins

* WIP on web plugin registration

* Only generate `package:flutter_web_plugins` imports if plugins are
defined

* Add parsing test

* Add documentation

* Fix analyzer warnings

* add license headers

* Add tests for package:flutter_web_plugins

* Run `flutter update-packages --force-upgrade`

* Fix analyzer errors

* Fix analyzer error in test

* Update copyright and remove flutter SDK constraints

* Enable tests since engine has rolled

* add flutter_web_plugins tests to bots

* Create an empty .packages file for WebFs test

* fix multiroot builds

* remove shout

* add basic test

* Update web_compilation_delegate.dart

* Address review feedback

* Update multiroot_asset_reader_test.dart

* Update multiroot_asset_reader_test.dart

* remove unpassable test

* fix for windows

* facepalm

This reverts https://github.com/flutter/flutter/pull/33525

This reverts commit 52ae9968.