feature: support EventSource

[Diluka]

Description

https://developer.mozilla.org/en-US/docs/Web/API/EventSource
https://caniuse.com/?search=EventSource

Proposed solution

Add a @Sse()?
https://docs.nestjs.com/techniques/server-sent-events

[Profex1999]

Any news on this?

[attilaorosz]

Not planned for the near future.

[TechQuery]

Not planned for the near future.

@attilaorosz but you closed this issue with "completed" status instead of "not planned"...

I think we should leave this issue open to wait someone's PR.