Enables ES module interoperability + upgrades jest & ts-jest

[huafu]

With typescript 2.7 came esModuleInterop option which allows to use import foo from 'foo' for both ES modules and CommonJS ones (read more there)

This PR:

• enables esModuleInterop and fixes imports related to this
• updates jest, ts-jest and typescript
• fixes all typing issues in tests (unused params, wrong typings, unused imports, ...)

Implicitly it'll fix #667

[DangerCI]

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[orta]

Nice! Yeah, this looks 👍

[orta]

Thanks a lot!

[peril-staging]

Thanks for the PR @huafu.

The Danger org conform to the Moya Community Continuity Guidelines, which means
that we want to offer any contributor the ability to control their destiny.

So, we've sent you an org invite - thanks huafu 🎉

Generated by 🚫 dangerJS

[peril-staging]

Thanks for the PR @huafu.

This PR has been shipped in v4.0.2 - CHANGELOG.