Generation of Vue 2 classes could possibly avoid _classStringToObject

### I am interested in helping provide a fix!

Yes

### Which generators are impacted?

- [ ] All
- [ ] Angular
- [ ] HTML
- [ ] Qwik
- [ ] React
- [ ] React-Native
- [ ] Solid
- [ ] Stencil
- [ ] Svelte
- [X] Vue
- [ ] Web components

### Reproduction case

https://mitosis.builder.io/?outputTab=G4VwpkA%3D&inputTab=M4NwpgNgLmQ%3D&code=DwZwxgTglgDgLgPgFAAIUFMAeMD2E4oA26BAJlCAIYBGxpKAvCgGaWEjoDcqRJLOYAK4hGKOBEFckwAPTho8ZNKgA7GIIJhClECAYAiZngC2AWlXq4%2BlFp0gAXOSq109W7vtGhImQiA%3D

### Expected Behaviour

The Vue 2 output in the the _Class Directive_ example uses minimal Vue code, e.g.

```

```

### Actual Behaviour

The Vue 2 output in the _Class Directive_ uses code which is quite verbose, converting a string into a class with a `_classStringToObject` helper:

```

```

### Additional Information

_No response_

Start with the linked reproduction and inspect how Vue 2 generates the Class Directive example. Trace the generation path that produces _classStringToObject; the work is done when the output uses a direct class binding like the expected example instead of the verbose helper conversion.

Written by the indexing model from the issue text.