fix(python-generator): ignore invalid namespaces

Python modules or packages are now ignored if their name is not a valid
Python namespace name.

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/expected/pkg/a/b.md

@@ -0,0 +1,9 @@
+# Module `pkg.a.b`
+
+## Function `fn`
+
+### Function signature
+
+```python
+fn()
+```

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a-b/c-d.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a-b/c.d.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a-b/c.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a.b/c-d.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a.b/c.d.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a.b/c.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a/b-c.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a/b.c.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/a/b.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/c-d.py

@@ -0,0 +1 @@
+def fn(): ...

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/pkg/c.d.py

@@ -0,0 +1 @@
+def fn(): ...