Async config file (#682)

* initial

* only donwload config once

* formatting

* update sample config

* sentry

* refactor load state

* fix build yaml

* Upper case enums

* change how defaults work. review fixes

* abstract initialization

* copyright

* gitignore styleing

* refactor initialization

* use dafualt as fallback

* internalInstance rename

* review

* remove acidentally added posthog file

* DSN rename

* update Copyright

* remove olm from the initializer

Co-authored-by: Timo K <timok@element.io>

.gitignore

@@ -5,3 +5,4 @@ dist
 dist-ssr
 *.local
 .idea/
+config.json