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>

sample.config.json

@@ -0,0 +1,13 @@
+{
+  "posthog": {
+    "api_key": "examplePosthogKey",
+    "api_host": "https://posthog.com"
+  },
+  "sentry": {
+    "environment": "main-branch",
+    "DSN": "https://examplePublicKey@o0.ingest.sentry.io/0"
+  },
+  "rageshake": {
+    "submit_url": "http://localhost:9110/api/submit"
+  }
+}