Support bracket colorization (rainbow brackets) (#43172)

Deals with https://github.com/zed-industries/zed/issues/5259

Highlights brackets with different colors based on their depth.
Uses existing tree-sitter queries from brackets.scm to find brackets,
uses theme's accents to color them.


https://github.com/user-attachments/assets/cc5f3aba-22fa-446d-9af7-ba6e772029da

1. Adds `colorize_brackets` language setting that allows, per language
or globally for all languages, to configure whether Zed should color the
brackets for a particular language.

Disabled for all languages by default.

2. Any given language can opt-out a certain bracket pair by amending the
brackets.scm like `("\"" @open "\"" @close) ` -> `(("\"" @open "\""
@close) (#set! rainbow.exclude))`

3. Brackets are using colors from theme accents, which can be overridden
as

```jsonc
"theme_overrides": {
  "One Dark": {
    "accents": ["#ff69b4", "#7fff00", "#ff1493", "#00ffff", "#ff8c00", "#9400d3"]
  }
},
```

Release Notes:

- Added bracket colorization (rainbow brackets) support. Use
`colorize_brackets` language setting to enable.

---------

Co-authored-by: MrSubidubi <dev@bahn.sh>
Co-authored-by: Lukas Wirth <lukas@zed.dev>
Co-authored-by: MrSubidubi <finn@zed.dev>
Co-authored-by: Lukas Wirth <me@lukaswirth.dev>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

crates/settings/src/settings_content/language.rs

@@ -412,6 +412,10 @@ pub struct LanguageSettingsContent {
     ///
     /// Default: []
     pub debuggers: Option<Vec<String>>,
+    /// Whether to use tree-sitter bracket queries to detect and colorize the brackets in the editor.
+    ///
+    /// Default: false
+    pub colorize_brackets: Option<bool>,
 }
 
 /// Controls how whitespace should be displayedin the editor.

crates/settings/src/settings_content/theme.rs

@@ -370,7 +370,7 @@ pub struct ThemeStyleContent {
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, MergeFrom, PartialEq)]
-pub struct AccentContent(pub Option<String>);
+pub struct AccentContent(pub Option<SharedString>);
 
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, MergeFrom, PartialEq)]
 pub struct PlayerColorContent {

crates/settings/src/vscode_import.rs

@@ -450,6 +450,7 @@ impl VsCodeSettings {
             prettier: None,
             remove_trailing_whitespace_on_save: self.read_bool("editor.trimAutoWhitespace"),
             show_completion_documentation: None,
+            colorize_brackets: self.read_bool("editor.bracketPairColorization.enabled"),
             show_completions_on_input: self.read_bool("editor.suggestOnTriggerCharacters"),
             show_edit_predictions: self.read_bool("editor.inlineSuggest.enabled"),
             show_whitespaces: self.read_enum("editor.renderWhitespace", |s| {