REORG: include: move sample.h to haproxy/sample{,-t}.h

This one is particularly tricky to move because everyone uses it
and it depends on a lot of other types. For example it cannot include
arg-t.h and must absolutely only rely on forward declarations to avoid
dependency loops between vars -> sample_data -> arg. In order to address
this one, it would be nice to split the sample_data part out of sample.h.
diff --git a/src/log.c b/src/log.c
index 7c62f6d..2bc0990 100644
--- a/src/log.c
+++ b/src/log.c
@@ -40,7 +40,7 @@
 #include <haproxy/fd.h>
 #include <proto/log.h>
 #include <haproxy/ring.h>
-#include <proto/sample.h>
+#include <haproxy/sample.h>
 #include <haproxy/sink.h>
 #include <proto/ssl_sock.h>
 #include <proto/stream.h>