[New App] Extension to Frappe EventStream [v13]

[olamide_shodunke]

This should be a PR

I want this but because of the sensitive nature of this, I am reluctant to touch it if it not a PR

I specifically asked for this from the frappe team in this thread

Event Streaming

Ok @rucha_mahabal Things are looking good so far. I however have a request to make. is there a way to filter the documents to be streamed? Use case scenario, in a retail environment I may not want to stream all Material transfers to all stores, I may just want to stream transfers meant for store A to Store A and B to B. How possible is this ?

Once again please send a PR

Good work