Add package_type field to repodata.json. ### Description

This PR adds `package_type` field to repodata.json and use it to create a list of unvendored standard libraries. After this we don't need to manage a hard-coded list of unvendored stdlib lists in pyodide-py.

### Checklists

- [x] Add / update tests

import chai from "chai";
import * as pyodideModule from "../../module";

describe("Module", () => {
  describe("noWasmDecoding", () => {
    it("should be false ", () => {
      const Module = pyodideModule.createModule();
      chai.assert.equal(Module.noWasmDecoding, false);
    });
  });
});

import chai from "chai";
import * as pyodideModule from "../../module";

describe("Module", () => {
  describe("noWasmDecoding", () => {
    it("should be false ", () => {
      const Module = pyodideModule.createModule();
      chai.assert.equal(Module.noWasmDecoding, false);
    });
  });
});
