Use package:typed_isolate for easier isolate management

[Levi-Lesches]

Hi @netdur! I saw your comment on Reddit about isolates, and I saw a reply offering to rewrite that part with package:actors, so as author of package:typed_isolate I thought I'd step in and give it a shot.

Basically, instead of managing the main isolate and model isolate in one class, I created three files:

• isolate_types.dart: defines the payloads sent back and forth between the two isolates
• isolate_parent.dart: an object that lives in the main isolate that is responsible for communicating with the model isolate
• isolate_child.dart: a new isolate to hold the model and communicate back with the parent

I wasn't sure if you were using to/from JSON for anything else, but if not, you can remove those too. Feel free to ignore this, but hopefully it makes your code clearer! I'm also looking for feedback for the package so if you see anything you wish were different please let me know!

[netdur]

Thank you @Levi-Lesches I am in middle of updating package with llama.cpp I will review your improvements