Performance optimization made to Metadata endpoints that improves speed by 10x

Our [Show NFT Metadata](https://docs.center.dev/reference/shownftmetadata-v2) and [Show NFT Metadata (Batched)](https://docs.center.dev/reference/shownftmetadatabatch-v2) endpoints are now much faster! We fixed a bug that was impacting performance in some cases. Give them a try!

Our Show NFT Metadata and Show NFT Metadata (Batched) endpoints are now much faster! We fixed a bug that was impacting performance in some cases. Give them a try!