feat: #167 - Maven forking working

Profiles dontUseTheForks and useTheForks added to maven configuration to allow forked/unforked execution using on smoke-tests project as a working example.
Tags can be automatically be added to reports showing batch/fork allocation by adding a hook as follows:
```
@Before
public void before() {
    SerenityTags.create().tagScenarioWithBatchingInfo();
}
```
To run smoke tests without forking: mvn clean verify -P dontUseTheForks
To run smoke tests with forking based on ScenarioLineCountStatistics: mvn clean verify -Dserenity.batch.count=1 -Dserenity.batch.number=1 -P useTheForks

To run smoke tests with forking based on MultiRunTestStatistics: mvn clean verify -Dserenity.batch.count=1 -Dserenity.batch.number=1 -Dserenity.test.statistics.dir=/statistics -P useTheForks

serenity-bdd / serenity-cucumber