Add ipython-with-reprs Sphinx directive

[mhostetter]

Adds a custom Sphinx directive ipython-with-reprs to simplify a common pattern in the galois documentation where an example is performed in each element representation in separate tabs.

Before

.. md-tab-set::

   .. md-tab-item:: Integer

      .. ipython:: python

         GF9 = galois.GF(3**2)
         print(GF9.properties)

   .. md-tab-item:: Polynomial

      .. ipython:: python

         GF9 = galois.GF(3**2, display="poly")
         print(GF9.properties)

   .. md-tab-item:: Power

      .. ipython:: python

         GF9 = galois.GF(3**2, display="power")
         print(GF9.properties)

After

.. ipython-with-reprs:: int,poly,power
   :name: GF9

   GF9 = galois.GF(3**2)
   print(GF9.properties)

Renders as (the same)

[codecov]

Codecov Report

Base: 97.08% // Head: 97.08% // No change to project coverage 👍

Coverage data is based on head (16e0764) compared to base (c17cd6a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #430   +/-   ##
=======================================
  Coverage   97.08%   97.08%           
=======================================
  Files          42       42           
  Lines        5345     5345           
=======================================
  Hits         5189     5189           
  Misses        156      156           

Impacted Files	Coverage Δ
src/galois/_fields/_array.py	98.90% <ø> (ø)
src/galois/_fields/_meta.py	100.00% <ø> (ø)
src/galois/typing.py	100.00% <ø> (ø)

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