Support for Zod Schemas in callback-data

[notvxn]

I've been using this library for managing callback data with inline keyboards and it's been incredibly useful for simplifying the process. However, I've encountered a situation where integrating Zod schemas for validation and parsing of callback data would significantly enhance the development experience, especially in terms of ensuring data integrity and simplifying the validation logic.

[eikowagenknecht]

I also wanted Zod validation and ended up writing my own packing / unpacking function. See this gist for the full source including tests.