Indexing PoC: Add search/browse (#94126)

* adds Filter gRPC and make protobuf

* adds route for querying the filter gRPC

* wires up Filter gRPC call

* [WIP] index from start

* renames gRPC endpoint to "Search"

* adds /apis/search route into k8s routes. Hacky for now.

* updates readme - wrong casing

* adds feature toggle for unified storage search

* hides US search behind feature flag. Clean up print statements.

* removes indexer - will be added in another PR

* Search: Add API Builder

* adds required method

* implementing UpdateAPIGroupInfo (WIP)

* adds groupversion

* commenting out for now

* remove unneeded code from experimenting and update register.go to match interface required

* list resources and load into index

* pass context

* namespaces search route

* lint

* watch

* add todo

* add todo

* merge

* cleanup

* add todo

* gen protobuf

* lint; fix migration issue

* Updates index mapping function to map unified storage object Value

* Changes Index() to pointer receiver - fixes panic

* add delete

* cleanup

* gets search/browse functioning. Results show up as base64 encoded. Still a WIP.

* Doesnt json re-encode gRPC response in search handler

* add kind to SearchRequest proto

* Updates query interface to be more generic. Make proto. Parses query params in api server.

* make protobuf

* removes unused method and imports

* Returns all indexed fields in search results. Adds pagination support (limit + offset).

* remove comment

* remove unused struct

* gets tenant in search k8s api handler

* adds hardcoded spec field mappings - starting with playlists

* adds all spec fields to search results

* moved helper function for field mappings into index

* only includes allowed spec fields in search results

* cleans up error handling

* removes debug log

---------

Co-authored-by: leonorfmartins <leonorfmartins@gmail.com>
Co-authored-by: Todd Treece <todd.treece@grafana.com>
Co-authored-by: Scott Lepper <scott.lepper@gmail.com>

pkg/services/featuremgmt/toggles_gen.json

@@ -3087,6 +3087,20 @@
         "codeowner": "@grafana/identity-access-team"
       }
     },
+    {
+      "metadata": {
+        "name": "unifiedStorageSearch",
+        "resourceVersion": "1726771421439",
+        "creationTimestamp": "2024-09-19T18:43:41Z"
+      },
+      "spec": {
+        "description": "Enable unified storage search",
+        "stage": "experimental",
+        "codeowner": "@grafana/search-and-storage",
+        "hideFromAdminPage": true,
+        "hideFromDocs": true
+      }
+    },
     {
       "metadata": {
         "name": "vizActions",
@@ -3141,4 +3155,4 @@
       }
     }
   ]
-}
+}