Indexer metadata syncing

[ptrwtts]

It would be nice if one indexer could be configured to get its metadata from another indexer. The simplest method would probably be:

• We add an API to return metadata for a token, in the exact same form as the metadata scripts
• The second indexer just points to the first indexer for it's metadata

The downside of this approach is that it will still be slow, and put load on the first indexer, however I assume it will still be superior to getting from the source (especially Open Sea).

I have a separate task to enable more efficient metadata syncing, by fetching multiple tokens at once. Is it worth having cross-indexing metadata without bulk? Or we should only implement if we can do bulk?