Update indoor type in the Style Spec (internal-7628)

GitOrigin-RevId: 41f67a400ec53904fa0bb49a87d379ab8a27acb1

Author: aleksproger

src/style-spec/reference/v8.json

@@ -6610,6 +6610,8 @@
   "indoor": {
     "*": {
       "type": "indoor_source",
+      "private": true,
+      "experimental": true,
       "doc": "Specification of an indoor source - sourceId and sourceLayer required for vector source, for GeoJSON sourceLayers should be omitted."
     }
   },

src/style-spec/types.ts

@@ -329,6 +329,9 @@ export type ImportSpecification = {
 };
 
 export type IndoorSpecification = {
+    /**
+     * @experimental This property is experimental and subject to change in future versions.
+     */
     [_: string]: IndoorSourceSpecification
 };