Highlighting for JSDoc 3.5.0 `@access package` missing

[aweebit]

Noticed it while looking for an explanation on why VSCode had highlighting for the apparently undocumented @api JSDoc tag, see microsoft/vscode#189812.

JSDoc 3.5.0 introduced support for the @package tag together with the corresponding package value for the @access tag. However, the value does not currently have special highlighting in VSCode like the other supported values (private, protected, public).