feat: Normalized server logging (#2567)

* feat: Normalize logging

* Remove scattered console.error + Sentry.captureException

* Remove mention of debug

* cleanup dev output

* Edge cases, docs

* Refactor: Move logger, metrics, sentry under 'logging' folder.
Trying to reduce the amount of things under generic 'utils'

* cleanup, last few console calls

flow-typed/globals.js

@@ -9,6 +9,8 @@ declare var process: {
   env: {
     [string]: string,
   },
+  stdout: Stream,
+  stderr: Stream,
 };
 
 declare var EDITOR_VERSION: string;