paker: load encrypted Python packages from memory

Ship Python code without leaving source on disk. Encrypted bundles arrive at runtime, load from memory. Works with numpy, pydantic, boto3. PyInstaller bundles Python code into a standalone binary. Run pyinstxtractor on that binary and you get every .pyc back in about ten seconds. uncompyle6 turns those into readable source. The "compiled" binary is a zip file with extra steps. paker takes a different approach. The binary ships without the proprietary code. At runtime, encrypted modules arrive fr