fix gossip

[turuslan]

• receiveMessage to know message received_from peers
• "publish" messages are big, split batch to separate frames for faster independent decoding
• fix lsquic_stream_write when lsquic buffer is full

[Copilot]

Pull Request Overview

This PR implements support for handling write buffer full conditions in QUIC streams and improves gossip message batching. The key changes include adding asynchronous write flow control to QUIC streams, exposing the full Message object (including metadata like sender) to gossip consumers, and splitting large gossip batches into separate protobuf messages.

• Added write flow control to QUIC streams to handle buffer full conditions
• Modified gossip to send Message objects instead of just payload data, including sender information
• Refactored gossip message batching to split control messages and publish messages into separate protobuf frames

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/transport/quic/stream.cpp	Implements retry logic for write operations when buffer is full
src/transport/quic/engine.cpp	Adds on_write callback handler to notify waiting writers
include/libp2p/transport/quic/engine.hpp	Adds writing field to StreamCtx for async write coordination
src/protocol/gossip/gossip.cpp	Refactors message batching, adds receiveMessage method, and includes sender in messages
include/libp2p/protocol/gossip/gossip.hpp	Updates Topic API to expose full Message objects
include/libp2p/protocol/gossip/config.hpp	Adds received_from field to Message struct

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