[pigeon] Fix async handling in C++ generator (flutter#3040)

* Add unit test

* Switch all errors to direct return

* Make 'wrapped' entirely local

* Switch reply to copy instead of reference

* Version bump

[xdg_directories] Return null from `getUserDirectory` instead of thro…

…wing exception (flutter#3033)

* fix: xdg.getUserDirectory to return null on missing executable

* Update changelog

* Fix review comments

[gis_web] Adds id.renderButton JS-interop. (flutter#3011)

* [gis_web] Adds id.renderButton API.

* Modernizes JS-interop so it's more compliant with dart2wasm.
* Updates examples, tests and docs.
* Bumps major version.

* Add the GsiButtonDataExtension class.

* Make oauth2 library more dart2wasm friendly.

* Reimplement hasGrantedA[ny|ll]Scopes in Dart.

* Fix oauth example.

* Added troubleshooting section to README.

* Add happy case tests for the oauth flow.

* Fix typo in config constructors.

* dart format

* Add some error handling to the library

* Add previously_granted_scopes field to overridable token config.

Make scopes a List of Strings in the hasGranted[Any|All]Scopes method.

[pigeon] Creates new Generator classes for each language (v3) (flutte…

…r#3022)

* Rename generator class to Adapter

* create new generator class and dart subclass

* cpp and dart test gen

* added files

* Adds Generator class to all generators

* adds swift

* Updates tests to use new Adapter naming scheme

* Dart generate methods

* convert all generate functions to use new method

* chagngelog

* remove Generator class fields

* move paths to options

* remove dartTestOptions

* Nits and combines source and header generators

* renames Adapter to GeneratorAdapter

* Update version number for breaking changes

* nits

* more personal nits

* Fixes dart header bug

* add gen files for clarity

* better field naming

* better field naming

* removed unneeded dart test generator

* Add filetype to generator

* Adds filetype as field to generatorAdapters

* nits

* assert

* Default FileType

* alt v4

* alt v5

* nits

[go_router] Fixes crashes when popping navigators manually (flutter#2952

)

* [go_router] Fixes crashes when popping navigators manually

* rename

* add additional test case

[go_router_builder] Update to `go_router` 6 (flutter#2977)

* 📝 Update the documentation to go_router 6

* ♻️ Update the example to use go_router 6

* ⬆️ Upgrade go_router_builder version

[pigeon] Relocates generator classes and updates imports (flutter#2985)

* start

* Class file transfer and skeleton comments

* relocate generator classes and update imports

* merge main and changelog update

[pigeon] wrap encodable lists in encodable value before reply (flutte…

…r#2968)

* wrap encodable lists before reply

* Changelog

* changelog

* basic test

* positive test and move

* nit

[go_router] Add GoRouterState parameters to GoRouterData and rename r…

…eplace methods (flutter#2848)

* ✨ Add redirectWithState method to GoRouteData

* ✅ Update the tests

* ⬆️ Increase version number

* ✏️ Better changelog

* 💥 Remove xxxWithState and adds a the context and the state as a parameter to all GoRouteData callbacks

* 📝 Update the change logs and version number

* 💥 Rename replace into pushReplacement

* 📝 Add pushReplacementNamed into change log

* 📝 Add migration guide's link to the read me

[pigeon] Add documentation comment support for Enum members (flutter#…

…2924)

* [pigeon] Add documentation comment support for Enum members

* [pigeon] Bump version