Replace Redux with zustand

[Brunonascdev]

This PR replaces our previous Redux-based state management with zustand, a lightweight, hook-based state-management library that reduces boilerplate and improves performance.

Rationale

We have some benefits to switching from Redux to zustand:

• Less Boilerplate: zustand’s hook-based API streamlines state management, eliminating much of the verbose configuration required by Redux.
• Performance Gains: The design of zustand allows for more efficient state updates, which can lead to better performance, especially in larger applications.
• Scalability and Simplicity: zustand offers a simple yet powerful way to manage state, making it easier to maintain and scale as our application grows.

Docs: https://zustand.docs.pmnd.rs/getting-started/introduction

[CassioMG]

In addition to that, we have the laboratory team using zustand for about a year now and they appear to like it:
stellar/laboratory#741
stellar/laboratory#1253

[CassioMG]

I know it was already there, but could we rename state to event or something else here? just to make it 100% clear it has nothing to do with store state - thanks!

[CassioMG]

LGTM! Just left a suggestion regarding a param name