[MSOURCES-130] Support sources path configuration

**[Bukaj Sytlos](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=JIRAUSER284001)** opened **[MSOURCES-130](https://issues.apache.org/jira/browse/MSOURCES-130?redirect=false)** and commented

When using lombok, there is a need to publish delomboked source code.

Unfortunately there seems not to exists a simple way to do this

https://stackoverflow.com/questions/52362413/create-and-install-de-lomboked-source-jar-in-maven

Would it be possible to support similiar configuration as in javadoc plugin

```java

all,-missing
${source.jdk.version}
${delombok.output}
${project.basedir}/src/main/java

```

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No further details from [MSOURCES-130](https://issues.apache.org/jira/browse/MSOURCES-130?redirect=false)