wip: first pass: server-side stream

[CassOnMars]

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PR-Codex overview

This PR introduces client streaming for the StreamSync method in the HubService interface.

Detailed summary

• Added StreamSync method to HubService interface for client streaming.
• Defined StreamSyncRequest and StreamSyncResponse messages.
• Updated TypeScript and protocol buffer files for client streaming support.

The following files were skipped due to too many changes: packages/hub-web/src/generated/request_response.ts, packages/hub-nodejs/src/generated/request_response.ts, packages/core/src/protobufs/generated/request_response.ts, apps/hubble/src/rpc/server.ts

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