Support for async tasks

[tilwinjoy]

Thanks for making such a great plugin!

Do you want to request a feature or report a bug?

feature

What is the current behavior?

Currently any continuous process such as gulp watch, webpack watch will stop the maven execution.

What is the expected behavior?

The exec-maven-plugin mentioned in README supports following options:

async- If set to true the child process executes asynchronously and build execution continues in parallel.

asyncDestroyOnShutdown - If set to true, the asynchronous child process is destroyed upon JVM shutdown. If set to false, asynchronous child process continues execution after JVM shutdown. Applies only to asynchronous processes; ignored for synchronous processes.

It would be great if this plugin allows the same so that we don't need to start such tasks manually from another terminal.

[Blacktiger]

I'd also love to have this feature. In my case I have multiple child projects that need to build frontend code and I'd like to be able to automatically set a watch build on all of the child projects from maven so devs don't need to make sure they are using the same node version when they want to do a watch build. Instead they could just run a maven command that kicks off all the relevant watch builds and kill maven when they were done.