Extract project_core out of project (#8438)

That's done to unblock work for dynamic tasks (`task` crate has to
access the worktree yet it is a dependency of a `project`).
Release Notes:

- N/A

crates/project/src/project_settings.rs

@@ -1,81 +0,0 @@
-use collections::HashMap;
-use gpui::AppContext;
-use schemars::JsonSchema;
-use serde::{Deserialize, Serialize};
-use settings::Settings;
-use std::sync::Arc;
-
-#[derive(Clone, Default, Serialize, Deserialize, JsonSchema)]
-pub struct ProjectSettings {
-    /// Configuration for language servers.
-    ///
-    /// The following settings can be overridden for specific language servers:
-    /// - initialization_options
-    /// To override settings for a language, add an entry for that language server's
-    /// name to the lsp value.
-    /// Default: null
-    #[serde(default)]
-    pub lsp: HashMap<Arc<str>, LspSettings>,
-
-    /// Configuration for Git-related features
-    #[serde(default)]
-    pub git: GitSettings,
-
-    /// Completely ignore files matching globs from `file_scan_exclusions`
-    ///
-    /// Default: [
-    ///   "**/.git",
-    ///   "**/.svn",
-    ///   "**/.hg",
-    ///   "**/CVS",
-    ///   "**/.DS_Store",
-    ///   "**/Thumbs.db",
-    ///   "**/.classpath",
-    ///   "**/.settings"
-    /// ]
-    #[serde(default)]
-    pub file_scan_exclusions: Option<Vec<String>>,
-
-    /// Treat the files matching these globs as `.env` files.
-    /// Default: [ "**/.env*" ]
-    pub private_files: Option<Vec<String>>,
-}
-
-#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
-pub struct GitSettings {
-    /// Whether or not to show the git gutter.
-    ///
-    /// Default: tracked_files
-    pub git_gutter: Option<GitGutterSetting>,
-    pub gutter_debounce: Option<u64>,
-}
-
-#[derive(Clone, Copy, Debug, Default, Serialize, Deserialize, JsonSchema)]
-#[serde(rename_all = "snake_case")]
-pub enum GitGutterSetting {
-    /// Show git gutter in tracked files.
-    #[default]
-    TrackedFiles,
-    /// Hide git gutter
-    Hide,
-}
-
-#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
-#[serde(rename_all = "snake_case")]
-pub struct LspSettings {
-    pub initialization_options: Option<serde_json::Value>,
-}
-
-impl Settings for ProjectSettings {
-    const KEY: Option<&'static str> = None;
-
-    type FileContent = Self;
-
-    fn load(
-        default_value: &Self::FileContent,
-        user_values: &[&Self::FileContent],
-        _: &mut AppContext,
-    ) -> anyhow::Result<Self> {
-        Self::load_via_json_merge(default_value, user_values)
-    }
-}