Remove dependency on `signal-utils/*` in lit renderer

[jacobsimionato]

Uses

• A2UI/renderers/lit/src/0.8/data/signal-model-processor.ts

  Line 19 in 5742c79

  import { SignalArray } from "signal-utils/array";

[jacobsimionato]

BTW the above only affects the lit renderer. The Angular renderer may have additional unwanted dependencies.

[sugoi-yuzuru]

Edit: Split this discussion to #475

Angular renderer also depends on markdown-it in https://github.com/google/A2UI/blob/main/renderers/angular/src/lib/data/markdown.ts

Hopefully, we can tackle them both together

[jacobsimionato]

For signals:

• Consider rxjs as well - we may already have this dependency. In Angular, you can adapt rxjs to Angular's signals.
• Mobx is a much smaller library which would be an advantage.

[jacobsimionato]

Split this into 3 issues

[jacobsimionato]

Split out two more issues from this:

• Figure out how to resolve Markdown dependency in OSS and google repository #475
• Remove dependency on SignalWatcher from @lit-labs/signals #464