Add rust_video: Rust keyframe extraction Python module

Introduce the rust_video package, a Rust-based ultra-fast video keyframe extraction tool with SIMD and parallel optimizations. Includes Cargo.toml and pyproject.toml for Rust and Python packaging, Python type hints (rust_video.pyi), and the main Rust library (lib.rs) with PyO3 bindings, performance benchmarking, and system info utilities.

rust_video/pyproject.toml

@@ -0,0 +1,15 @@
+[build-system]
+requires = ["maturin>=1.9,<2.0"]
+build-backend = "maturin"
+
+[project]
+name = "rust_video"
+requires-python = ">=3.8"
+classifiers = [
+    "Programming Language :: Rust",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+]
+dynamic = ["version"]
+[tool.maturin]
+features = ["pyo3/extension-module"]