Null Profile Stats

### Contact Details

_No response_

### What is the expected behavior?

You are probably already aware of this, but I couldn't find an existing issue to track.

When querying the stats entity within profiles, it would be awesome to be able to get user level stats like number of followers, following, posts, comments, etc...

### What is the current behavior?

Right now the stats entity within profiles returns all null values:

### Reproduction steps

```bash
1. Navigate to playground: https://thegraph.com/hosted-service/subgraph/nazeeh21/lens-protocol-matic

2. Run query:

{
profiles(first: 10) {
id
handle
stats{
totalFollowers
totalPosts
totalFollowing
}
}
}
```
```

### Version

_No response_

### Relevant log output

_No response_

### Your Environment

Subgraph: https://thegraph.com/hosted-service/subgraph/nazeeh21/lens-protocol-matic

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Run the supplied profiles query in the linked hosted-service playground and confirm that the stats fields return null. Trace how profile stats are populated and expose totalFollowers, totalPosts, and totalFollowing; done means these fields return the corresponding user-level counts for profiles.

Written by the indexing model from the issue text.