adds documentation to generated types

[ehsan2003]

adds documentation ( and documentation generation scripts ) for generated types ( api.d.ts ) it uses deno to run generation scripts ( deno 1.15.1 used )

[painor]

Very good work!. Good job.

Maybe we should put this in https://github.com/gram-js/docs instead and manually update them here. There is no reason why we should bundle these files in the main repo since they are not necessary for running the software.