Move StopwatchExtension to pioneer

[smoyer64]

From the example code in the JUnit 5 documentation - https://github.com/selesy/junit5/blob/issues/343-document-testrule-compatibility/documentation/src/test/java/example/testrule/StopwatchExtension.java

[Bukama]

As I'm struggeling at the same as when I tried to implement the @Issue annotation I'll post a link to the branch here and if anyone want's to adapt the current state feel free to do so.

https://github.com/Bukama/junit-pioneer/tree/stopwatch

My problems are:

1. Entering the extension context inside a test to verify if the values of another store are beeing stored
2. Verifiy if the TestReporter prints the information correct inside the resulting XML

I checked via a System.out that the extension is executed, but I don't find a way to enter the context from a test class. I tried to pass it via n paramter, but this leads to an error, that there's no ParameterResolver for the ExtensionContext class.

I also tried to pass an TestReporter parameter. This can be resolved, but the interface only has methods to publish something via the reporter, but not to check if it contains the right data.

In both cases there are no further explanations in the Jupiter documentation.

Maybe you find a way to verify the execution of the extension.

[Bukama]

I opened a PR, but @Michael1993 wants to work on it before it gets merged. So I assign this bishue to him.

[Michael1993]

The PR looks good (to me)!