Adding collections from different chains in the same component

I would like to be able to view collections from different chains in my Uniquery app. This would imply that I could do something like:

```env
# in my .env file
ADDRESS=JHfxh28HRxd5fSY97fFpPfFXHmGGFGctNNr9GvnnNeQPVkS
CHAINS=["ksm", "bsx"]
```

and customize the `utils/indexer.ts` file to be able to handle the indexers of the different chains.

Please help me figure this out :)

Start with utils/indexer.ts and inspect how the .env ADDRESS and CHAINS values are used. Determine the indexer behavior needed for ksm and bsx, then verify that the Uniquery app can display collections from both chains for one address.

Written by the indexing model from the issue text.