bpo-31072: Rename the new filter argument for zipapp.create_archive (GH-3049)

* Rename the new argument to "filter"
* Improve tests for the new functionality
* Add a "What's New" entry.

bpo-31072: Add a filter argument to zipapp.create_archive (GH-3021)

* Add an include_file argument to allow callers to decide which files to include
* Document the new argument

Now general path-like objects are supported, not just pathlib.Path.

As a result, explicitly support pathlib.Path objects as arguments.
Also added tests for the CLI interface.

Thanks to Paul Moore for the PEP and implementation.