Allow .zed/tasks.json local configs (#8536)

![image](https://github.com/zed-industries/zed/assets/2690773/e1511777-b4ca-469e-8636-1e513b615368)

Follow-up of
https://github.com/zed-industries/zed/issues/7108#issuecomment-1960746397

Makes more clear where each task came from, auto (re)load
.zed/config.json changes, properly filtering out other worktree tasks.

Release Notes:

- Added local task configurations

crates/picker/src/highlighted_match_with_paths.rs

@@ -0,0 +1,70 @@
+use ui::{prelude::*, HighlightedLabel};
+
+#[derive(Clone)]
+pub struct HighlightedMatchWithPaths {
+    pub match_label: HighlightedText,
+    pub paths: Vec<HighlightedText>,
+}
+
+#[derive(Debug, Clone, IntoElement)]
+pub struct HighlightedText {
+    pub text: String,
+    pub highlight_positions: Vec<usize>,
+    pub char_count: usize,
+}
+
+impl HighlightedText {
+    pub fn join(components: impl Iterator<Item = Self>, separator: &str) -> Self {
+        let mut char_count = 0;
+        let separator_char_count = separator.chars().count();
+        let mut text = String::new();
+        let mut highlight_positions = Vec::new();
+        for component in components {
+            if char_count != 0 {
+                text.push_str(separator);
+                char_count += separator_char_count;
+            }
+
+            highlight_positions.extend(
+                component
+                    .highlight_positions
+                    .iter()
+                    .map(|position| position + char_count),
+            );
+            text.push_str(&component.text);
+            char_count += component.text.chars().count();
+        }
+
+        Self {
+            text,
+            highlight_positions,
+            char_count,
+        }
+    }
+}
+
+impl RenderOnce for HighlightedText {
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+        HighlightedLabel::new(self.text, self.highlight_positions)
+    }
+}
+
+impl HighlightedMatchWithPaths {
+    pub fn render_paths_children(&mut self, element: Div) -> Div {
+        element.children(self.paths.clone().into_iter().map(|path| {
+            HighlightedLabel::new(path.text, path.highlight_positions)
+                .size(LabelSize::Small)
+                .color(Color::Muted)
+        }))
+    }
+}
+
+impl RenderOnce for HighlightedMatchWithPaths {
+    fn render(mut self, _: &mut WindowContext) -> impl IntoElement {
+        v_flex()
+            .child(self.match_label.clone())
+            .when(!self.paths.is_empty(), |this| {
+                self.render_paths_children(this)
+            })
+    }
+}

crates/picker/src/picker.rs

@@ -8,6 +8,8 @@ use std::{sync::Arc, time::Duration};
 use ui::{prelude::*, v_flex, Color, Divider, Label, ListItem, ListItemSpacing};
 use workspace::ModalView;
 
+pub mod highlighted_match_with_paths;
+
 enum ElementContainer {
     List(ListState),
     UniformList(UniformListScrollHandle),