Delete _Bracket and update the _Curve to be able to ']->' and '<-['

Author: Carloscerq

doc/api/next_api_changes/removals/20444-CE.rst

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+Change the drawing parameter in ArrowStyle
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+For drawing arrows heads or brackets at the arrow, use the ``arrow``
+parameter with the drawing of the desired arrow.

doc/users/next_whats_new/arrow_param.rst

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+New param ``arrow`` for the ``ArrowStyle`` arrows
+-------------------------------------------------
+
+The new ``arrow`` substitutes the use of ``beginarrow``, ``beginarrow``
+params in the creation of arrows. It receives arrows strings like '<-',
+']-[' and ']->'.

doc/users/next_whats_new/new_arrow_styles.rst

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+New arrow styles for ``ConnectionPatch``
+----------------------------------------
+
+The new ``]->`` and ``<-[`` can be passed as the ``arrowstyle``
+params to the ``ConnectionPatch``.