add support for @package access

[myphysicslab]

In addition to the @Private and @Protected tags, closure compiler also supports @Package, which corresponds to the notion from Java of "package private":
https://developers.google.com/closure/compiler/docs/js-for-compiler

Marks a member or property as package private. Only code in the same directory can access names marked @Package. In particular, code in parent and child directories cannot access names marked @Package.

It would be great for JSDoc to add this if not too difficult. I see @Package listed in issue #605, but no separate issue for it. For me, just being able to exclude items marked @Package from the JSDoc output would be useful.

[hegemonic]

Yep, this one is on the list of tags to implement. I'll try to prioritize this one.

[vickychijwani]

This would be great to have. My use-case is the same as @myphysicslab's.

[hegemonic]

Fixed on master. The @package tag will be supported in JSDoc 3.5.0.