Fix py-markdown plugin (#1008)

* fix wrong console method and unescape the tag content before running markdown on it

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* add markdown plugin example test

* add PyMarkdown minimal test

* remove commented code

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* remove import of console from pyscript

* remove unused imports

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Fabio Pliger <fpliger@anaconda.com>

pyscriptjs/tests/py-unit/test_python_plugins.py

@@ -0,0 +1,17 @@
+from unittest.mock import Mock
+
+import py_markdown
+
+
+class TestPyMarkdown:
+    def test_plugin_hooks(self, monkeypatch):
+        console_mock = Mock()
+        monkeypatch.setattr(py_markdown, "console", console_mock)
+        config = "just a config"
+        runtime = "just a runtime"
+
+        py_markdown.plugin.configure(config)
+        console_mock.log.assert_called_with("configuration received: just a config")
+
+        py_markdown.plugin.afterStartup(runtime)
+        console_mock.log.assert_called_with("runtime received: just a runtime")