chore: typescript migration

[joshuafsharp]

Wondering if you're keen on getting type safety in this project, as mentioned in the following issue:
#11

I've been working on updates in my fork, so happy to share the changes I've made to use Typescript.
I tried to make the minimal changes possible to add Typescript support, so the functionality should be equivalent to the latest commit on main.

The only other change I made is to simplify the phaser client initialisation with typescript. There's a MainScene class containing all the preload, create and update functions, which is supplied to the Phaser config.

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[dzoba]

Thanks for this! I will review.