chore: allow install scripts to run on Windows

[Jack-Works]

Motivation

Allow developing on Windows

Summary

Add cross-env to execute scripts with environment variables.

Test plan

No test needed.

Other

The pre-commit hook failed:

FAIL __tests__/detect-core-js.test.js
  ● Ensures that package do not include core-js dependency after build

    expect(received).toContain(expected) // indexOf

    Expected substring: "Based on your code and targets, core-js polyfills were not added"
    Received string:    "Successfully compiled 5 files with Babel (701ms).
    "

      28 |   // run `DEBUG_CORE_JS=true yarn build:lib` to debug issues with introduced core-js dependency
      29 |   expect(result).not.toContain('Added following core-js polyfill');
    > 30 |   expect(result).toContain(
         |                  ^
      31 |     'Based on your code and targets, core-js polyfills were not added'
      32 |   );
      33 | }, 15000);

      at Object.<anonymous> (__tests__/detect-core-js.test.js:30:18)

But I think it doesn't caused by my changes.

Another bug related to the upstream dependencies of Windows compatibility:

chrismohr/lerna-to-typescript-project-references#2

[callstack-bot]

Hey @Jack-Works, thank you for your pull request 🤗.
The coverage report for this branch can be viewed here.