[milo] Add BuildSummary and common models.

milo/api/resp/verbosity_string.go

Index: milo/api/resp/verbosity_string.go
diff --git a/milo/api/resp/verbosity_string.go b/milo/api/resp/verbosity_string.go
new file mode 100644
index 0000000000000000000000000000000000000000..61ff08fe28a7b7633557d287124ed17dc09e7b44
--- /dev/null
+++ b/milo/api/resp/verbosity_string.go
@@ -0,0 +1,16 @@
+// Code generated by "stringer -type=Verbosity"; DO NOT EDIT.
+
+package resp
+
+import "fmt"
+
+const _Verbosity_name = "NormalHiddenInteresting"
+
+var _Verbosity_index = [...]uint8{0, 6, 12, 23}
+
+func (i Verbosity) String() string {
+	if i < 0 || i >= Verbosity(len(_Verbosity_index)-1) {
+		return fmt.Sprintf("Verbosity(%d)", i)
+	}
+	return _Verbosity_name[_Verbosity_index[i]:_Verbosity_index[i+1]]
+}