feat(python): add native distribution and release infrastructure

- add the Rust-backed Python API with PyStemmer compatibility
- distribute standard compiled models as a separate Python package
- generate model artifacts during builds instead of storing them in Git
- add GitHub release and Pages-backed package index workflows
- add Python tests, benchmarks, documentation, and Gradle integration
- refresh the documentation site, branding, and language benchmarks

.github/act/python-models-standard.json

@@ -0,0 +1,5 @@
+{
+  "inputs": {
+    "version": "1.0.0"
+  }
+}

.github/act/python-native.json

@@ -0,0 +1,5 @@
+{
+  "inputs": {
+    "version": "4.1.0"
+  }
+}