support websocket connection

[yahuio]

This pull request adds support for connecting to FIX sessions over WebSocket in addition to the existing TCP and proxy-based connections. It introduces new configuration options for WebSocket endpoints, refactors the dialer logic to support multiple connection types, and updates the relevant tests to cover the new functionality. Additionally, some configuration documentation has been clarified, and dependencies in the CI workflow have been updated.

WebSocket Connection Support:

• Added new configuration options WebsocketLocation and WebsocketOrigin in config/configuration.go for specifying WebSocket endpoints and origins.
• Implemented WebsocketDialer and refactored the dialer logic in dialer.go to support both TCP and WebSocket connections, with selection based on configuration. [1] [2]
• Updated the session factory to allow sessions with only WebsocketLocation set (no SocketConnectHost required).

Testing Enhancements:

• Added tests for WebSocket dialer behavior in dialer_test.go, including handling of missing origins and correct configuration.
• Added a test for session factory configuration with only WebsocketLocation set in session_factory_test.go.

Codebase Refactoring:

• Refactored the dialer interface and usage throughout the codebase (e.g., in initiator.go) to use the new Dialer abstraction, removing direct dependency on TCP/proxy dialers. [1] [2] [3] [4]
• Updated dialer-related tests to work with the new abstraction. [1] [2] [3]

Configuration Documentation:

• Clarified that SocketConnectHost and SocketConnectPort are only required for initiators using socket connections, not WebSocket. [1] [2]

CI Workflow Maintenance:

• Updated the MongoDB GitHub Action version in .github/workflows/ci.yaml to 1.12.1 for improved reliability and compatibility. [1] [2]