chore: refactor the global state and improve signer (#56)

* refactor

* update

* .

* rustfmt

* .

* .

* .

* .

* .

* add document

* .

* add logout

* handle error

* chore: update gpui

* adjust timeout

crates/common/src/debounced_delay.rs

@@ -1,6 +1,9 @@
-use futures::{channel::oneshot, FutureExt};
+use std::marker::PhantomData;
+use std::time::Duration;
+
+use futures::channel::oneshot;
+use futures::FutureExt;
 use gpui::{Context, Task};
-use std::{marker::PhantomData, time::Duration};
 
 pub struct DebouncedDelay<E: 'static> {
     task: Option<Task<()>>,