replace websocket client

[KazuCocoa]

https://github.com/imanel/websocket-ruby
as same as selenium webdriver https://github.com/SeleniumHQ/selenium/search?l=Ruby&q=websocket

[KazuCocoa]

https://github.com/SeleniumHQ/selenium/blob/trunk/rb/CHANGES
https://github.com/SeleniumHQ/selenium/blob/trunk/rb/lib/selenium/webdriver/common/websocket_connection.rb

Probably ruby_lib_core can refer to the lib instead of this own implementation

[KazuCocoa]

the lib's attach_socket_listener is handled as DevTools Protocol, so should not use as-is.