Handle the 16MB limit in MongoDB with a dedicated error
### Link

_No response_

### Description

As per comment on https://github.com/huggingface/datasets-server/pull/780#issuecomment-1422238212 
We should handle the db limitation per document with a dedicated error
Handle the 16MB limit in MongoDB with a dedicated error: ### Link

_No response_

### Description

As per comment on https://github.com/huggingface/datasets-server/pull/780#issuecomment-1422238212 
We should handle the db limitation per document with a dedicated error