evaluate kerchunk as streamable API endpoint

it would be sweet if we can use [kerchunk](https://fsspec.github.io/kerchunk/) to provide a single streamable API endpoint for any given data type. this could open up significant web viz capabilities.

caveat: like our zarr endpoint we need to ensure that the bytes are sent directly from s3 rather than our API server.

Start by reviewing the existing zarr endpoint and the linked kerchunk documentation. Determine the endpoint scope, supported data types, and how S3 can serve bytes directly rather than routing them through the API server. Done means a defined streamable endpoint design that supports the intended web-visualization use case.

Written by the indexing model from the issue text.