bug: filter service node creates a new stream for every single message

[Ivansete-status]

Problem

While running the following example: https://github.com/waku-org/lab.waku.org/tree/066be09ee11fba01b3c6f8ed0e5966de88225104/examples/experimental/railgun-repro
... against a nwaku node base on Railgun infra, @danisharora099 discovered that we easily reach the limit of max number of streams (see https://github.com/waku-org/js-waku/blob/88e33a90fd2a4de93d4ce0cb99dbd77ff454ef34/packages/core/src/lib/filter/index.ts#L47.)

Therefore, we are apparently creating a new stream for every message that is being sent to the subscribed filter clients.
We need to use the same stream for all messages.

Thanks so much @danisharora099 for such great tool! Super insightful 😍

Waku version

v0.33.1

[danisharora099]

IMO this is now resolved? Or is there more followup expected?

[Ivansete-status]

Hey there @danisharora099 !
I'm adapting the nwaku tests to the new implementation. Once the tests pass properly I'll set the PR #3198 as ready for review and once merged, I will close that one :D