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/server/wire.go

@@ -5,7 +5,6 @@ package server
 
 import (
 	"github.com/google/wire"
-
 	sdkhttpclient "github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
 
 	"github.com/grafana/grafana/pkg/api"
@@ -153,6 +152,7 @@ var wireBasicSet = wire.NewSet(
 	postgres.ProvideService,
 	mysql.ProvideService,
 	mssql.ProvideService,
+	store.ProvideEntityEventsService,
 	httpclientprovider.New,
 	wire.Bind(new(httpclient.Provider), new(*sdkhttpclient.Provider)),
 	serverlock.ProvideService,