Expose PyCapsule type and methods

[pabloferz]

No description provided.

[codecov]

Codecov Report

Merging #114 (5fd1996) into main (8757a30) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #114   +/-   ##
=======================================
  Coverage   20.14%   20.14%           
=======================================
  Files          70       70           
  Lines        4030     4030           
=======================================
  Hits          812      812           
  Misses       3218     3218           

Impacted Files	Coverage Δ
src/cpython/pointers.jl	100.00% <ø> (ø)

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