[MDEP-661] Add option to exclude optional dependencies for copy-dependencies

**[David Smiley](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=dsmiley)** opened **[MDEP-661](https://issues.apache.org/jira/browse/MDEP-661?redirect=false)** and commented

When using copy-dependencies, I would like to specify the exclusion of my project's optional dependencies.

I have some annotation libs marked optional, and these need not be shipped to production.
I need to compile against them.

---

**Issue Links:**
- [MDEP-266](https://issues.apache.org/jira/browse/MDEP-266) Add parameter to configure copy-dependencies to also copy optional dependencies

Start at the copy-dependencies goal and review the related MDEP-266 issue for existing optional-dependency behavior. Add a way to exclude optional dependencies from copied production artifacts while retaining them for compilation, and verify the goal's behavior with its existing tests.

Written by the indexing model from the issue text.