Initial QSfera import

Server/vendor/github.com/testcontainers/testcontainers-go/validator.go

@@ -0,0 +1,7 @@
+package testcontainers
+
+// Validator is an interface that can be implemented by types that need to validate their state.
+type Validator interface {
+	// Validate validates the state of the type.
+	Validate() error
+}