refactor: Significantly refactor how conditions work internally (#1886)

- Much improved API cleanliness and testability to allow further
extensibility in future
 - Simplified code in `live` view

This technically contains a small change in how overrides work in the
`live` view. Since that change is _closer_ to the documentation, and
since this is likely to be rarely used, this is not considered a
breaking change. Previously, overrides for a given live camera would
always render _as if_ that camera was selected, vs was actually
selected. Now, overrides will only apply in the live view when the
camera is _actually_ selected. If this is an issue for you in practice,
lets discuss.

src/components/live/provider.ts

@@ -25,8 +25,8 @@ import { STREAM_TROUBLESHOOTING_URL } from '../../const.js';
 import { localize } from '../../localize/localize.js';
 import liveProviderStyle from '../../scss/live-provider.scss';
 import {
-  ExtendedHomeAssistant,
   AdvancedCameraCardMediaPlayer,
+  ExtendedHomeAssistant,
   FullscreenElement,
 } from '../../types.js';
 import { aspectRatioToString } from '../../utils/basic.js';
@@ -210,6 +210,7 @@ export class AdvancedCameraCardLiveProvider
         dispatchMediaUnloadedEvent(this);
       }
     }
+
     if (changedProps.has('liveConfig')) {
       if (this.liveConfig?.show_image_during_load) {
         this._importPromises.push(import('./providers/image.js'));