feat: Add WebSocket support for URLSession, Starscream, and Apollo

[gtsifrikas]

Summary

This PR adds comprehensive WebSocket logging support to Pulse, enabling developers to inspect WebSocket traffic alongside regular HTTP requests.

Features

URLSession WebSocket Support

• Extended URLSessionProxyDelegate with URLSessionWebSocketDelegate conformance
• Added WebSocketTaskProxy to intercept send and receive operations
• Updated URLSessionProxy with webSocketTaskProxy(with:) method for full logging

New WebSocket Event Types

• webSocketTaskOpened: Logs when a WebSocket connection is established
• webSocketTaskClosed: Logs connection closure with code and reason
• webSocketFrameSent: Logs outgoing frames (text/binary)
• webSocketFrameReceived: Logs incoming frames (text/binary)

Core Data Model Extensions

• Added WebSocketFrameEntity for persistent storage of frames
• Added webSocketFrames relationship to NetworkTaskEntity
• Frame entities track type, data, direction, and timestamps

PulseStarscream Integration (new library target)

• StarscreamLogger: WebSocketDelegate proxy for logging
• Convenience extension: WebSocket.enablePulseLogging()
• Logs connection lifecycle and frame data

PulseApollo Integration (new library target)

• ApolloWebSocketLogger: WebSocketTransportDelegate proxy
• Supports GraphQL subscription logging with JSON serialization
• Handles Apollo's internal DataDict/SelectionSet types
• Convenience extension: WebSocketTransport.enablePulseLogging()

UI Enhancements

• WebSocketInspectorView: Timeline of frames with expandable details
• WebSocket badge (WS) in console task cells
• Task type filtering for WebSocket connections
• JSON formatting for text frames

Demo App

• Added WebSocketDemoView with three test scenarios:
  • URLSession WebSocket (echo.websocket.org)
  • Starscream WebSocket (echo.websocket.org)
  • Apollo WebSocket (simulated GraphQL subscription)
• Tab-based UI with embedded Pulse console

Documentation

• Updated DocC documentation with WebSocket usage examples
• Added WebSocket section to Network Logging article

Usage Examples

URLSession

let session = URLSessionProxy(configuration: .default)
let wsTask = session.webSocketTaskProxy(with: url)
wsTask.resume()

try await wsTask.send(.string("Hello"))
let message = try await wsTask.receive()

Starscream

import PulseStarscream

let socket = WebSocket(request: request)
socket.enablePulseLogging(delegate: myDelegate)
socket.connect()

Apollo GraphQL

import PulseApollo

let transport = WebSocketTransport(websocket: ws, store: store)
transport.enablePulseLogging(delegate: self, url: url)

Testing

• Builds successfully with swift build
• Demo app builds and runs on iOS Simulator
• Manual testing with echo.websocket.org

Breaking Changes

None - all changes are additive.

Dependencies Added

• Starscream 4.0+ (for PulseStarscream target)
• Apollo iOS 1.0+ (for PulseApollo target)