[DISCUSS] I think we should move enable_web_socket to routes rather in plugin

[????Lien]

Hi guys, 
    for now the web socket  enable button is hidden in proxy-rewrite plugin, 
which I think is very inconvenient for users to put a web-socket server behind 
APISIX.
   proxy-write is more like NGINX parameter modifier, rather than service or 
function controller to enable or disable some features.
 
   Scenario:
   When I have a web socket server explode URI like this 
/web_socket/123456,(123456 is a URI var)??
   then I create a router  /web_socket/*.
   here comes the problem if I use proxy-write, no doubt I want keep the URI 
same to backend server while enable the web-socket .

 
  

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