feat(boundaries): package name as tag punning (#10151)
### Description
Allows a package name to be used as a tag ([tag
punning](https://en.wikipedia.org/wiki/Type_punning)). We're adding this
feature to help users define an explicit set of packages that their
package can be imported by. Combined with the ability to define package
rules in a package `turbo.json` (next PR after this, coming soon), and
code owner restrictions, this will permit package owners to control who
can import their package.
### Testing Instructions
Added test in `boundaries_tags` fixture
