[services] [6/n] authentication for search websocket server

Summary:
Authentication verification for websocket connections to search websocket server.
Current implementation maintains connections must provide userID, deviceID, and accessToken.

Depends on D10392

Test Plan: Verified on staging with successful authentication and error messages

Reviewers: bartek, varun

Reviewed By: varun

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10438