Export representation declaration types, upgrade dart_style to 2.3.4,…

… and publish 4.10.0 (#445)

RepresentationDeclaration and RepresentationDeclarationBuilder were never
exported in 4.8.0. This also cleans up a TODO to use dart format for
extension type tests and preps for publish.

Support annotations on unnamed libraries; 4.9.0 (#440)

Add support for extension types (#437)

Corresponds to the syntax defined in https://github.com/dart-lang/language/blob/main/accepted/future-releases/extension-types/feature-specification.md#syntax.

Update emitter.dart (#429)

* Update emitter.dart

Add a newline after lambdas.

* Rev version

* Fix typo

Prepare to publish (#426)

Drop the version suffix.

Drop package name tag prefix for workflow (#420)

Fix an incorrect copy/paste.

rev the minor version and prep for publishing (#391)

release 4.0.0 (#321)