[MDEP-600] Only defined group Id for unpack goal

**[HerrDerb](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=herrderb)** opened **[MDEP-600](https://issues.apache.org/jira/browse/MDEP-600?redirect=false)** and commented

Instead of

```java
 
    
        com.company.group
        projectA
    
        
        com.company.group
        projectB
    
        
        com.company.group
        projectB
    
        
        com.company.group
        projectB
    
   
```

I would like to be able to define

```java
 
    
        com.company.group
   
   
```

with the goal to only target artifacts with the groupId _com.company.group_
defined in my _dependencies._

This avoids big lists and double mentioning of artefacts.

---

**Affects:** 3.0.2

Start by reviewing the unpack goal's existing artifactItems configuration and how its dependency selection is described in the issue. Define what artifactGroups should accept and verify that unpacking selects only dependencies with the configured groupId, while avoiding repeated artifact entries.

Written by the indexing model from the issue text.