Search: in-memory index (#47709)

* #45498: add entity events table

* #45498: add entity events service

* #45498: hook up entity events service to http server

* #45498: use `dashboards.id` rather than `uid` and `org_id` in grn

* Update pkg/services/entityevents/service.go

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

* #45498: move entityeventsservice to services/store

* #45498: add null check

* #45498: rename

* #45498: fix comment

* #45498: switch grn back to uid

* Search: listen for updates (#47719)

* #45498: wire entity event service with searchv2

* load last event id before building index for org 1

* fix service init in integration tests

* depend on required subset of event store methods

* Update pkg/services/sqlstore/migrations/entity_events_mig.go

Co-authored-by: Alexander Emelin <frvzmb@gmail.com>

* #45498: pointer receiver

* #45498: mockery!

* #45498: add entity events service to background services

* dashboard query pagination, allow queries while re-indexing

* log level cleanups, use rlock, add comments

* fix lint, check feature toggle in search v2 service

* use unix time for event created column

* add missing changes for created column

* fix integration tests init

* log re-index execution times on info level

* #45498: fix entityEventsService tests

* #45498: save events on dashboard delete

* use camel case for log labels

* formatting

* #45498: rename grn to entityid

* #45498: add `IsDisabled` to entityEventsService

* #45498: remove feature flag from migration

* better context usage, fix capacity, comments/cleanups

* replace print with logger

* Revert "#45498: remove feature flag from migration"

This reverts commit ed23968898.

* revert:revert:revert conditional feature flag

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
Co-authored-by: Alexander Emelin <frvzmb@gmail.com>

pkg/api/http_server.go

@@ -151,6 +151,7 @@ type HTTPServer struct {
 	PluginSettings               *pluginSettings.Service
 	AvatarCacheServer            *avatar.AvatarCacheServer
 	preferenceService            pref.Service
+	entityEventsService          store.EntityEventsService
 }
 
 type ServerOptions struct {
@@ -182,7 +183,7 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 	dashboardProvisioningService dashboards.DashboardProvisioningService, folderService dashboards.FolderService,
 	datasourcePermissionsService permissions.DatasourcePermissionsService, alertNotificationService *alerting.AlertNotificationService,
 	dashboardsnapshotsService *dashboardsnapshots.Service, commentsService *comments.Service, pluginSettings *pluginSettings.Service,
-	avatarCacheServer *avatar.AvatarCacheServer, preferenceService pref.Service,
+	avatarCacheServer *avatar.AvatarCacheServer, preferenceService pref.Service, entityEventsService store.EntityEventsService,
 ) (*HTTPServer, error) {
 	web.Env = cfg.Env
 	m := web.New()
@@ -257,6 +258,7 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 		permissionServices:           permissionsServices,
 		AvatarCacheServer:            avatarCacheServer,
 		preferenceService:            preferenceService,
+		entityEventsService:          entityEventsService,
 	}
 	if hs.Listener != nil {
 		hs.log.Debug("Using provided listener")