Implement Git status SSE updates

[jonasehrlich]

This PR contains multiple changes, related to the Git status.

• Update Git status API to contain more information
• Handler for SSE requests that sends a Git status as a first message
• Debounced file watcher on the repository sending updates through a std::sync::mpsc::channel
• Receiver of the FS events in a tokio task that sends the current Git status through a tokio::sync::broadcast::channel to the individual event streams

On the client side there are also some changes:

• Added status bar component that shows the current branch and added/renamed/changed/deleted files, this can be extended to solve all Git operations (pin, checkout, ...) in the future
• Added Typesafe and reconnecting wrapper around the EventSource API - although we should evaluate if we switch to WebSockets in the future as SSE only supports 6 connections to one host per browser instance. Maybe this also does not matter as debug-flow would anyways fall apart with different flows in different tabs as the zustand stores would overwrite each other.
• Added useEventStream hook to declare subscription to an event type

Closes #102

[TobTheRock]

nit: I would probably prefer a method e.g. Status::try_from_repository in this case. As TryFrom is more about type conversions.
Alternatively we could just have an impl block:

impl Repository {
pub fn status() Result<Status> {
....
}
}

[jonasehrlich]

used Status::try_from_repository I don't like to have all this logic in git2_ox::Repository

[TobTheRock]

Don't want to introduce rxjs 👿 ?
Instead of implementing typed events and event stream by hand (or vibe)

[jonasehrlich]

only halfway vibed 🗡️

I would need to read into rxjs