head-management: add format-setter-v1 extension

wire/jay_head_ext_format_setter_v1.txt

@@ -0,0 +1,15 @@
+request destroy (destructor) {
+
+}
+
+event reset {
+
+}
+
+event supported_format {
+    format: u32,
+}
+
+request set_format {
+    format: u32,
+}

wire/jay_head_manager_ext_format_setter_v1.txt

@@ -0,0 +1,7 @@
+request destroy (destructor) {
+
+}
+
+event head {
+    head: id(jay_head_ext_format_setter_v1) (new),
+}