Many language extensions add status bar entries for various information tidbits, like version, language server status, project etc. There is many inconsistencies for how this happens like alignment isn't always in sync with the language name or visibility isn't in sync with the active editor.

We should help extensions do a better job by adding a dedicated "language status" API, some kind of LanguageStatusProvider which we query whenever the editor changes. In its simplest form language status can be text, detail (supporting codicons and md), and severity.