Support Kotlin Multiplatform

[kitakkun]

I wonder if this plugin is applicable to KMP or not, but I think it's worth doing enough.

Concerns

Current implementation only works on Android project.
back-in-time plugin completely depends on Flipper Plugin.
Is it possible exchanging messages between iOS native Flipper Plugin and BackInTimeDebugService(which is responsible for receiving events from debuggable instances)?

[kitakkun]

I think it is much easier to implement manually WebSocket-based communication between debug target app and debugger app.
I feel Ktor will do this thing well.

After confirming WebSocket communication works well on different platforms, I will move on developing pure Kotlin debugger application.