Chore: Refactor OAuth/social package to service (#35403)

* Creating SocialService

* Add GetOAuthProviders as socialService method

* Add OAuthTokenService

* Add GetOAuthHttpClient method to SocialService

* Rename services, access socialMap from GetConnector

* Fix tests by mocking oauthtoken methods

* Move NewAuthService into Init

* Move OAuthService to social pkg

* Refactor OAuthService to OAuthProvider

* Fix nil map error, rename file, simplify tests

* Fix bug for Forward OAuth Identify

* Remove file after rebase

pkg/api/http_server.go

@@ -13,8 +13,10 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/grafana/grafana/pkg/login/social"
 	"github.com/grafana/grafana/pkg/services/libraryelements"
 	"github.com/grafana/grafana/pkg/services/librarypanels"
+	"github.com/grafana/grafana/pkg/services/oauthtoken"
 
 	"github.com/grafana/grafana/pkg/api/routing"
 	httpstatic "github.com/grafana/grafana/pkg/api/static"
@@ -105,6 +107,8 @@ type HTTPServer struct {
 	Alertmanager           *notifier.Alertmanager                  `inject:""`
 	LibraryPanelService    librarypanels.Service                   `inject:""`
 	LibraryElementService  libraryelements.Service                 `inject:""`
+	SocialService          social.Service                          `inject:""`
+	OAuthTokenService      *oauthtoken.Service                     `inject:""`
 	Listener               net.Listener
 }