feat: Add update checker tooling

Add the initial dataset, version checker, tests, and project setup files so the update checker can be run and validated.

tests/test_versions.py

@@ -0,0 +1,27 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from check_updates import compare_versions
+
+
+def test_compare_versions_newer():
+    assert compare_versions("1.2.3", "1.2.4") == 1
+
+
+def test_compare_versions_equal():
+    assert compare_versions("2.0.0", "2.0.0") == 0
+
+
+def test_compare_versions_older():
+    assert compare_versions("2.1.0", "2.0.9") == -1
+
+
+def test_compare_versions_unparseable():
+    assert compare_versions("1.2", "1.2.3") is None
+
+
+def test_compare_versions_prerelease():
+    assert compare_versions("1.2.3-alpha.1", "1.2.3") == 1
+    assert compare_versions("1.2.3", "1.2.3-alpha.1") == -1