Add asset repository and refactor asset service (#540)

* build endpoint to get asset count by month

* Added asset repository

* Added create asset

* get asset by device ID

* Added test for existing methods

* Refactor additional endpoint

* Refactor database api to get curated locations and curated objects

* Refactor get search properties

* Fixed cookies parsing for websocket

* Added API to get asset count by time group

* Remove unused code

web/src/lib/stores/websocket.ts

@@ -1,5 +1,4 @@
 import { Socket, io } from 'socket.io-client';
-import { writable } from 'svelte/store';
 
 let websocket: Socket;