zed_extension_api: Fork new version of extension API (#29579)

This PR forks a new version of the `zed_extension_api` in preparation
for new changes.

Release Notes:

- N/A

crates/extension_api/wit/since_v0.5.0/settings.rs

@@ -0,0 +1,40 @@
+use serde::{Deserialize, Serialize};
+use std::{collections::HashMap, num::NonZeroU32};
+
+/// The settings for a particular language.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct LanguageSettings {
+    /// How many columns a tab should occupy.
+    pub tab_size: NonZeroU32,
+}
+
+/// The settings for a particular language server.
+#[derive(Default, Debug, Serialize, Deserialize)]
+pub struct LspSettings {
+    /// The settings for the language server binary.
+    pub binary: Option<CommandSettings>,
+    /// The initialization options to pass to the language server.
+    pub initialization_options: Option<serde_json::Value>,
+    /// The settings to pass to language server.
+    pub settings: Option<serde_json::Value>,
+}
+
+/// The settings for a particular context server.
+#[derive(Default, Debug, Serialize, Deserialize, PartialEq, Eq)]
+pub struct ContextServerSettings {
+    /// The settings for the context server binary.
+    pub command: Option<CommandSettings>,
+    /// The settings to pass to the context server.
+    pub settings: Option<serde_json::Value>,
+}
+
+/// The settings for a command.
+#[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+pub struct CommandSettings {
+    /// The path to the command.
+    pub path: Option<String>,
+    /// The arguments to pass to the command.
+    pub arguments: Option<Vec<String>>,
+    /// The environment variables.
+    pub env: Option<HashMap<String, String>>,
+}