Create a base api handler for authenticated web socket APIs

[3coins]

Problem

Current jupyter-server code doesn't have a base handler or utility for creating authenticated web socket APIs. An example of an authenticated web socket is present in AuthenticatedZMQStreamHandler. https://github.com/jupyter-server/jupyter_server/blob/77be2f5095db195db6aa872e24b5d49c3b53892b/jupyter_server/base/zmqhandlers.py#L303-L348

When working with authenticated web socket APIs, this code will be duplicated for each handler.

Proposed Solution

• Create a new WebSocketAPIHandler that new APIs can inherit from. This will contain functions that all jupyter web sockets should inherit, for example, set_default_handlers, initialize, get_compression_options etc.
• Create a AuthWebSocketAPIHandler that additionally adds authentication for web sockets. This will contain functions, that add authentication for web sockets, for example pre_get and get.

Additional context

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[3coins]

cc @bollwyvl @Zsailer I also noticed a WebSocketMixin which has common web socket options; is this something we should move into the base handler as part of this effort? https://github.com/jupyter-server/jupyter_server/blob/77be2f5095db195db6aa872e24b5d49c3b53892b/jupyter_server/base/zmqhandlers.py#L121-L230