feat: Fully automate releases

[haruki7049]

To automate release...

• Initialize mkBinaryInstall function
• Initialize sources.json as below:
  • Initialize sources.json and fetch-releases.py
  • Setup fetch-releases.py
  • fetch sources.json by using fetch-releases.py

{
  "godot-bin": {
    "mono": [
      "3.5.1": {
        "version": "3.5.1",
        "url": "https://github.com/godotengine/godot/releases/download/3.5.1-stable/Godot_v3.5.1-stable_mono_x11_64.zip",
        "sha256": "1xsqfwyfhncmffsv9vj7a11m1s4iz7xk00k8ywhnvqiaz3i4d67f",
        "arch": "x86_64-linux"
      }
    ]
  }
}

• Use map function and listToAttrs