Add missing package exports

[acelaya]

This PR adds two new package exports for the pattern library and the old Tailwind JS preset (we may not need the latter for a long time, but it cannot be imported if not defined here).

Additionally, it makes sure the ClosableContext is exported from the root of the package.

[acelaya]

I could add the /lib prefix to these two, so that existing imports keep working, but since these are dev assets, they can be updated in every project, and I think they look better without that part.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (bbf171b) to head (e22a16e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2095   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           71        71           
  Lines         1364      1364           
  Branches       509       509           
=========================================
  Hits          1364      1364           

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