Rewritten with TypeScript

[alizahid]

Features

• Rewritten in TypeScript
• Refactored to be more readable
• Documentation updated
• Prettier and ESLint added

Todo

• [x] Build package on install so we can remove dist
• [x] Add webhook verification
• [x] Testing
• [x] Unit tests

[ziyadparekh]

@alizahid Awesome work!! Ready to merge this as soon as you resolve the conflicts. Thanks again :)