Renderer: Add sanitize API (#50936)

* svg fun

* #50597: add proto

* #50597: add sanitizer methods

* #50597: add provider

* #50597: use sanitizer

* #50597: use sanitizer

* update grafana to match new api

* add comments

* add capability check

* add timing

* update sanitize path

* improve log message

* strings.HasPrefix rather than filepath.IsAbs

* filepath.Clean + filepath.ToSlash for windows

* read 404

* remove `path.clean` from `getPathAndScope`

* add resp body close

* remove unneeded prop

* Update pkg/services/rendering/rendering.go

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

* remove test files

* filepath.ToSlash correct wrapping

* filepath.ToSlash correct wrapping

* filepath.ToSlash comment

* compilation error

* lint fix

* fix error message

* Update pkg/services/rendering/rendering.go

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

* add `image/svg+xml` mime type

* refactored log

* refactored log

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

pkg/plugins/backendplugin/pluginextensionv2/rendererv2.pb.go

@@ -1,21 +1,20 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.15.8
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: rendererv2.proto
 
 package pluginextensionv2
 
 import (
 	context "context"
-	reflect "reflect"
-	sync "sync"
-
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status "google.golang.org/grpc/status"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
 )
 
 const (