### What?
Generates types for `joins` property.
Example from our `joins` test, keys are type-safe:
<img width="708" alt="image"
src="https://github.com/user-attachments/assets/f1fbbb9d-7c39-49a2-8aa2-a4793ae4ad7e">
Output in `payload-types.ts`:
```ts
collectionsJoins: {
categories: {
relatedPosts: 'posts';
hasManyPosts: 'posts';
hasManyPostsLocalized: 'posts';
'group.relatedPosts': 'posts';
'group.camelCasePosts': 'posts';
filtered: 'posts';
singulars: 'singular';
};
};
```
Additionally, we include type information about on which collection the
join is, it will help when we have types generation for `where` and
`sort`.
### Why?
It provides a better DX as you don't need to memoize your keys.
### How?
Modifies `configToJSONSchema` to generate the json schema for
`collectionsJoins`, uses that type within `JoinQuery`
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