Kotlinx serialization support

[makeevrserg]

This PR contains serializers along with tests for them:

• ImmutableListSerializer
• PersistentListSerializer
• ImmutableSetSerializer
• PersistentSetSerializer
• PersistentHashSetSerializer
• ImmutableMapSerializer
• PersistentMapSerializer
• PersistentHashMapSerializer

This PR is relevant to #63

[LionZXY]

I support the changes, but I also understand how unpleasant it will be to add a new library to the standard distribution.
The main problem is Serialization and ImmutableList are from the same "Kotlin world" and people expect better support between them

From the user's point of view, the solution proposed by @makeevrserg is the best - the presence of an officially supported solution from the kotlin team.

But I understand that this will be difficult for the Kotlin team - maybe then make a separate library for this and link to it?

Related with #63 , #138, #17

[xiaozhikang0916]

Is this pr still in progress? Noticed that it has been 7 months without update.

And, is it possible to provide a well configured Serializers module so users can avoid adding @Serializable(with = ImmutableXXXSerializer::class) to all immutable collection properties?

[makeevrserg]

Is this pr still in progress? Noticed that it has been 7 months without update.

And, is it possible to provide a well configured Serializers module so users can avoid adding @Serializable(with = ImmutableXXXSerializer::class) to all immutable collection properties?

Is this pr still in progress? Noticed that it has been 7 months without update.

And, is it possible to provide a well configured Serializers module so users can avoid adding @Serializable(with = ImmutableXXXSerializer::class) to all immutable collection properties?

@xiaozhikang0916 The PR is not in draft - it's finished. I didn't updated it because there's no answer from team.

I personally don't like Serializers module because it's not explicit. But as I know, you can add explicit serializer into your json StringFormat.