misc: update build setup (#2306)

sgl-kernel/Makefile

@@ -0,0 +1,19 @@
+.PHONY: tree ln install build clean test
+
+tree:
+	@tree --prune -I "__pycache__|*.egg-info|*.so|build"
+
+ln:
+	@rm -rf build && cmake . -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DCMAKE_CUDA_COMPILER=nvcc -B build && rm -rf compile_commands.json && ln -s build/compile_commands.json compile_commands.json
+
+install:
+	@pip install -e .
+
+build:
+	@python3 setup.py bdist_wheel
+
+clean:
+	@rm -rf build dist *.egg-info
+
+test:
+	@pytest tests/