Investigate potential rst grammar to include as a built-in extension (#144680)

extensions/vscode-colorize-tests/test/colorize-fixtures/test.rst

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+*italics*, **bold**, ``literal``.
+
+1. A list
+2. With items
+   - With sub-lists ...
+   - ... of things.
+3. Other things
+
+definition list
+  A list of terms and their definition
+
+Literal block::
+
+    x = 2 + 3
+
+
+Section separators are all interchangeable.
+
+=====
+Title
+=====
+
+--------
+Subtitle
+--------
+
+Section 1
+=========
+
+Section 2
+---------
+
+Section 3
+~~~~~~~~~
+
+| Keeping line
+| breaks.
+
+
++-------------+--------------+
+| Fancy table | with columns |
++=============+==============+
+| row 1, col 1| row 1, col 2 |
++-------------+--------------+
+
+============ ============
+Simple table with columns
+============ ============
+row 1, col1  row 1, col 2
+============ ============
+
+Block quote is indented.
+
+  This space intentionally not important.
+
+Doctest block
+
+>>> 2 +3
+5
+
+A footnote [#note]_.
+
+.. [#note]  https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#footnotes
+
+
+Citation [cite]_.
+
+.. [cite] https://bing.com
+
+a simple link_.
+
+A `fancier link`_ .
+
+.. _link: https://docutils.sourceforge.io/
+.. _fancier link: https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
+
+
+An `inline link <https://code.visualstudio.com>`__ .
+
+.. image:: https://code.visualstudio.com/assets/images/code-stable.png
+
+.. function: example()
+   :module: mod
+
+
+:sub:`subscript`
+:sup:`superscript`
+
+.. This is a comment.
+
+..
+  And a bigger,
+  longer comment.
+
+
+A |subst| of something.
+
+.. |subst| replace:: substitution