RxGroovy migration

[vietj]

Read me

Read this first before creating an issue:

• do not use this issue tracker to ask questions, instead use one of these channels. Questions will likely be closed without notice.
• you shall create a feature request only when it is general purpose enough.
• make sure that the feature is not already

Describe the feature

Give the simplest and best explanation.

Use cases

A list of use cases this feature will enable and the value it creates.

Contribution

Who should implement this feature ? are you volunteering for implementing this feature or
do you know that is able and willing implement this feature ?