Loki: Create component for sending logs to Loki (#51500)

pkg/components/loki/logproto/extensions.go

@@ -0,0 +1,7 @@
+package logproto
+
+type Streams []Stream
+
+func (xs Streams) Len() int           { return len(xs) }
+func (xs Streams) Swap(i, j int)      { xs[i], xs[j] = xs[j], xs[i] }
+func (xs Streams) Less(i, j int) bool { return xs[i].Labels <= xs[j].Labels }