LDAP: Move LDAP globals to Config (#63255)

* structure dtos and private methods

* add basic LDAP service

* use LDAP service in ldap debug API

* lower non fatal error

* remove unused globals

* wip

* remove final globals

* fix tests to use cfg enabled

* restructure errors

* remove logger from globals

* use ldap service in authn

* use ldap service in context handler

* fix failed tests

* fix ldap middleware provides

* fix provides in auth_test.go

pkg/server/wire.go

@@ -69,6 +69,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/guardian"
 	"github.com/grafana/grafana/pkg/services/hooks"
 	ldapapi "github.com/grafana/grafana/pkg/services/ldap/api"
+	ldapservice "github.com/grafana/grafana/pkg/services/ldap/service"
 	"github.com/grafana/grafana/pkg/services/libraryelements"
 	"github.com/grafana/grafana/pkg/services/librarypanels"
 	"github.com/grafana/grafana/pkg/services/live"
@@ -234,6 +235,8 @@ var wireBasicSet = wire.NewSet(
 	live.ProvideService,
 	pushhttp.ProvideService,
 	contexthandler.ProvideService,
+	ldapservice.ProvideService,
+	wire.Bind(new(ldapservice.LDAP), new(*ldapservice.LDAPImpl)),
 	jwt.ProvideService,
 	wire.Bind(new(jwt.JWTService), new(*jwt.AuthService)),
 	ngstore.ProvideDBStore,