invoker should also support the @{ } syntax like the surefire plugin

The surefire plugin supports a special `@{ ... }` syntax to do 'late' resolution of maven properties (not at POM evaluation time but at plugin execution time). See https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#argLine for details.

It would be great if the invoker plugin would support the same syntax for the <mavenOpts> configuration setting.