feat: fetch features and store locally for offline users (#706)

* feat: fetch features and store locally for offline users

* feat: handle success and error cases

* refactor: move offline activation code reading/validation to snjs

* chore: update after renaming snjs function

* fix: correct condition for checking offline users

* feat: let users remove their previous offline keys (WIP)

* refactor: handle setOfflineFeatures function response accordingly

* feat: remove corresponding local data when removing offline key

* fix: use snjs' confirm dialog instead of custom one

* feat: show warning before installing extension from untrusted source

* refactor: move functions for validating external feature url and checking if custom server host was used to snjs

* chore: put correct snjs version

* chore: make `eslint-plugin-react-hooks` in yarn.lock to match the `develop` branch

* chore: deps update

* chore: deps update

package.json

@@ -72,7 +72,7 @@
     "@reach/listbox": "^0.16.2",
     "@standardnotes/features": "1.8.0",
     "@standardnotes/sncrypto-web": "1.5.3",
-    "@standardnotes/snjs": "2.16.3",
+    "@standardnotes/snjs": "2.17.1",
     "mobx": "^6.3.5",
     "mobx-react-lite": "^3.2.1",
     "preact": "^10.5.15",