[next]: Add types to the packages

[ahuseyn]

To achieve stronger type safety across the codebase, we need to add TypeScript support to the existing Faust packages.

• Add TypeScript types/interfaces.
• Ensure all types are exported as needed.
• Refactor existing code to align with new types if necessary.
• Run a full type check (tsc) and resolve all errors.

Note: This issue applies to the next version of Faust and it's packages.