Add Context information to building python packages

If we want to have python packages in one module that depend on each other, e.g.,

"prepare": {
    "python": {
      "packages": {
        "package_a": {},
        "package_b": {
          "install_editable": [
            "$MODULE_PATH/package_a"
          ]
        }
      }
    }
  },

it is necessary to pipe the environment context through to the make command for building the package