Implement MVP in Vue3

[w0rd-driven]

Replace the existing functionality with a Vue3 scaffold taken from many examples like kino_db or kino_explorer.

• [x] Create basic components for Select and Range inputs
• [x] Save frontend selections as attributes
• [x] Editor updating doesn't have a roundtrip, that's why I pull it out of the %Kino.Markdown{content} section. We just need a change event on the front end that triggers update_text.
• [x] Add labels
• [ ] Add Play/Pause button
• [ ] Add Stop button

We'll create a companion Livebook to work through what the final version should be. I wanted to keep the initial draft though I could've really benefitted from source control on day zero.

The companion Livebook should have a basic interview conversation between multiple voices in various configurations.

[w0rd-driven]

There's no useful frontend event so keeping the same speak event is fine for now.

This is rough as I don't quite know all the ins and outs of what I copy pasted into place but I'm getting there. The interactions between the front and backend are a little odd to pick up at first.

[w0rd-driven]

Adding interaction buttons will be saved for later if implemented at all. I don't quite know how all of this will play together. I could see a potential future where the editor is replaced as it doesn't need syntax highlighting. I thought maybe I could get the voices to use inflection but I doubt it. For the broadest compatibility, it could be useful to bring in easy-speech but that could be a very heavy-handed dependency if it worked.