Supervisor 226

What's Changed

• Expose all services/discovery with possible add-ons (#1772) @pvizeli
• Handle new API / Frontend early boot (#1770) @pvizeli
• Make addon model abstract (#1768) @frenck
• Docs string and exception message improvements (#1767) @frenck
• Slowdown docker stop/start to avoid issue on slow IO (#1763) @pvizeli
• Bump gitpython from 3.1.2 to 3.1.3 (#1764) @dependabot-preview
• Fix typo in discovery log message (#1761) @Dinth