Prepare the Dart FFI package for publish

[mosuem]

Prepare the Dart bindings for publishings.

Do not submit until truongsinh/icu-flutter#3 is resolved.

[sffc]

This is for the Dart package? It looks fine but I trust you two on the details :)

[robertbastian]

I guess we can merge because it doesn't auto-publish?

[mosuem]

@robertbastian I would hold off until the name issue is resolved.

[robertbastian]

Well the name is not changing with this PR.

[mosuem]

If the current owner of package:icu wants to keep it, we will have to change the name. I would prefer to do this in this PR, so that the package is indeed prepared for publishing :)

[JulianSchmidtZollsoft]

Hi :)
@mosuem do you have a rough estimate for when this dart package will be published? We want to use it for locale comparing Strings.

Thanks in advance.

[robertbastian]

We're at the moment undecided whether/how to release this package. Our goal is to release a new intl package, which uses ICU4X under the hood, this might or might not use this package. You can find the draft at https://github.com/dart-lang/i18n/tree/main/pkgs/intl, and there's a work-in-progress pull request to use ICU4X.

Open issues at the moment are binary size and how to do locale selection.

[robertbastian]

This is mostly obsolete