[feature] implement MongoDB adapter #6
Description
Needed: denodrivers/mongo#261
Reference: https://socket.io/docs/v4/mongo-adapter/
Node.js impl: https://github.com/socketio/socket.io-mongo-adapter
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Needed: denodrivers/mongo#261
Reference: https://socket.io/docs/v4/mongo-adapter/
Node.js impl: https://github.com/socketio/socket.io-mongo-adapter