move websockets to sdk

[ohnorobo]

implementation examples and registering in configurl stay in x/

This will let us remove the dependency on x/ in outline-apps

[alexander-potemkin]

@fortuna , I'm wondering if websocket support is complete from sdk now with your PR from earlier, or does this PR has to be merged as well, to be able to use websocket from within the SDK (in other apps)?

[fortuna]

Websocket is in the SDK, just not in the config.

[fortuna]

Nevermind, it is in the config too: https://pkg.go.dev/github.com/Jigsaw-Code/outline-sdk/x/configurl https://github.com/Jigsaw-Code/outline-sdk/blob/main/x/configurl/websocket.go

[alexander-potemkin]

Thank you, awesome!