Relates to: https://github.com/coder/coder/issues/18101
This PR introduces a new `backedpipe` package that provides reliable
bidirectional byte streams over unreliable network connections. The
implementation includes:
- `BackedPipe`: Orchestrates a reader and writer to provide transparent
reconnection and data replay
- `BackedReader`: Handles reading with automatic reconnection, blocking
reads when disconnected
- `BackedWriter`: Maintains a ring buffer of recent writes for replay
during reconnection
- `RingBuffer`: Efficient circular buffer implementation for storing
data
The package enables resilient connections by tracking sequence numbers
and replaying missed data after reconnection. It handles connection
failures gracefully, automatically reconnecting and resuming data
transfer from the appropriate point.
Michael Suchacz