tooltip2 (#3237)

- Fix executor.timer() in gpui2
- Add support for tooltips 

[[PR Description]]

Release Notes:

- N/A

crates/ui2/src/components/tooltip.rs

@@ -1,6 +1,4 @@
-use gpui2::{
-    div, px, Div, ParentElement, Render, SharedString, Styled, View, ViewContext, VisualContext,
-};
+use gpui2::{div, px, Div, ParentElement, Render, SharedString, Styled, ViewContext};
 use theme2::ActiveTheme;
 
 #[derive(Clone, Debug)]
@@ -12,10 +10,6 @@ impl TextTooltip {
     pub fn new(str: SharedString) -> Self {
         Self { title: str }
     }
-
-    pub fn build_view<C: VisualContext>(str: SharedString, cx: &mut C) -> C::Result<View<Self>> {
-        cx.build_view(|cx| TextTooltip::new(str))
-    }
 }
 
 impl Render for TextTooltip {
@@ -27,6 +21,7 @@ impl Render for TextTooltip {
             .bg(theme.colors().background)
             .rounded(px(8.))
             .border()
+            .font("Zed Sans")
             .border_color(theme.colors().border)
             .text_color(theme.colors().text)
             .pl_2()