Consider SignalR Pull Model / Streaming for JavaScript and Java client

[TanayParikh]

As a part of #30289 / #33491 we didn't leverage SignalR's native streaming capability as we wanted to delay sending additional data chunks until the ones sent had been consumed by the server. Without this, the client could queue the entire stream at once (via subject.next(nextData)) thereby blocking interactivity till the stream was transferred. This would in turn present a breaking change for certain functionality like file uploads. Instead we took a send/invoke based approach where we send X chunks, and then invoke every X+1 chunks to get a "heartbeat" for the stream, and allow other requests to interrupt the transfer.

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We're moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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