feat: Add type exports

[ksaaskil]

• Exports the types of Gitlab, UsersBundle, etc. using the built-in InstanceType defined as follows:

/**
 * Obtain the return type of a constructor function type
 */
type InstanceType<T extends new (...args: any) => any> = T extends new (...args: any) => infer R ? R : any;

• Should resolve the missing type problem of Documentation: Simple Typescript usage example #384

import * as gitlab from 'gitlab'
const aaa = new gitlab.Gitlab({ host:'foo', token:'bar' });
const bbb : WHAT_AM_I??? = aaa;

• Not sure if this could break anything, just a suggestion ¯_(ツ)_/¯

[jetersen]

Shouldn't import be import { Gitlab } from 'gitlab'

[ksaaskil]

Shouldn't import be import { Gitlab } from 'gitlab'

That would definitely work, I just copy-pasted the code in issue description from issue #384

[jdalrymple]

🎉 This PR is included in version 10.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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