Replace whole repo with latest content from branch rhel-8.8.0

Content corresponds with RHEL dist-git commit c1b5596

.fmf/version

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+1

plan.fmf

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+execute:
+  how: tmt
+environment:
+  PYTHON: python3.11
+discover:
+  - how: shell
+    dist-git-source: true
+    tests:
+    - name: bundled demos
+      require:
+      - python3.11-devel
+      - python3.11-numpy
+      - gcc-c++
+      - gcc
+      test: |
+        cd $TMT_SOURCE_DIR/cython-*/Demos &&
+        sed "s/\bpython\b/python3.11/" -i Makefile callback/Makefile \
+                                          embed/Makefile  &&
+        make test
+  - how: fmf

tests/helloworld.pyx

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+# https://cython.readthedocs.io/en/latest/src/tutorial/cython_tutorial.html
+print("Hello World")
+
+def works():
+    return True

tests/main.fmf

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+test: ${PYTHON:-python3} tutorial.py
+

tests/tutorial.py

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+import pyximport
+pyximport.install()
+
+import helloworld
+assert helloworld.works()