feature: support json sequential streaming (or json line streaming)

[lrstanley]

✨ Describe the feature you'd like

OpenAPI currently doesn't support representing this, so I don't think it's worth the trouble at the moment, however, it looks like they are planning to support some form of json streaming (not the same as chunked encoding or similar). E.g. via json-seq, json-lines, etc. ref: OAI/OpenAPI-Specification#3730

This would allow streamed pagination via HTTP requests (see also ent/ent#4185 for ent, which would help with this).