Rule proposal: consistent typing for Map and Set

I sometimes forget that I can type Map/Set with a generic on the right hand side. I'd like to add a rule to enforce typing Map/Set with a generic on the RHS, instead of typing the variable on the LHS.

This would be an error:

```ts
const mySet: Set<string> = new Set();
```

And would autocorrect to:

```ts
const mySet = new Set<string>();
```