[MNG-8089] Introduce fat-JAR types

[cstamas]

These are dependency types to be used when dependency is "self contained", or is wanted be used as such: handle if like it has no dependencies, if any.

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https://issues.apache.org/jira/browse/MNG-8089

[cstamas]

@desruisseaux ping

[desruisseaux]

I suggest to provide only the fatjar type, without the classpath-fatjar and modular-fatjar for now, and modify the Javadoc of fatjar for saying that it goes on the classpath only. The reason is that a JAR file can contain at most one module-info.class file. So either the module-info or all JARs had to be removed, or either they were merged in some way. But the latter would be tricky, and the result would still not be the same as the separated JARs. So I think it is probably safer to said that a fat JAR is never modular.

[cstamas]

This makes perfect sense, will do the changes soon

[cstamas]

Updated PR