Update typings to new standards

[SimonSchick]

declare module ModuleName is somewhat deprecated and does require additional setup, having 1 main typings files (see https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html) makes it much easier to consume this library, please consider updating accordingly.

Ideally you would have 1 index.d.ts files which then re-exports all the modules, the TS docs explain these things quiet well.
This also allows proper importing via the import keyword and makes a much better user experience.

[pgilmorepf]

Thank you for your submission.
I agree, that we should make this change, but I don't have a timeline for when that will happen.
Sorry for the delay.

[toddbellMSFT]

We are now addressing this issue here PlayFab/SDKGenerator#621