Add support for interacting with Claude in the assistant panel (#11798)

Release Notes:

- Added support for interacting with Claude in the assistant panel. You
can enable it by adding the following to your `settings.json`:

    ```json
    "assistant": {
        "version": "1",
        "provider": {
            "name": "anthropic"
        }
    }
    ```

crates/assistant/src/assistant.rs

@@ -7,7 +7,7 @@ mod saved_conversation;
 mod streaming_diff;
 
 pub use assistant_panel::AssistantPanel;
-use assistant_settings::{AssistantSettings, OpenAiModel, ZedDotDevModel};
+use assistant_settings::{AnthropicModel, AssistantSettings, OpenAiModel, ZedDotDevModel};
 use client::{proto, Client};
 use command_palette_hooks::CommandPaletteFilter;
 pub(crate) use completion_provider::*;
@@ -72,6 +72,7 @@ impl Display for Role {
 pub enum LanguageModel {
     ZedDotDev(ZedDotDevModel),
     OpenAi(OpenAiModel),
+    Anthropic(AnthropicModel),
 }
 
 impl Default for LanguageModel {
@@ -84,6 +85,7 @@ impl LanguageModel {
     pub fn telemetry_id(&self) -> String {
         match self {
             LanguageModel::OpenAi(model) => format!("openai/{}", model.id()),
+            LanguageModel::Anthropic(model) => format!("anthropic/{}", model.id()),
             LanguageModel::ZedDotDev(model) => format!("zed.dev/{}", model.id()),
         }
     }
@@ -91,6 +93,7 @@ impl LanguageModel {
     pub fn display_name(&self) -> String {
         match self {
             LanguageModel::OpenAi(model) => model.display_name().into(),
+            LanguageModel::Anthropic(model) => model.display_name().into(),
             LanguageModel::ZedDotDev(model) => model.display_name().into(),
         }
     }
@@ -98,6 +101,7 @@ impl LanguageModel {
     pub fn max_token_count(&self) -> usize {
         match self {
             LanguageModel::OpenAi(model) => model.max_token_count(),
+            LanguageModel::Anthropic(model) => model.max_token_count(),
             LanguageModel::ZedDotDev(model) => model.max_token_count(),
         }
     }
@@ -105,6 +109,7 @@ impl LanguageModel {
     pub fn id(&self) -> &str {
         match self {
             LanguageModel::OpenAi(model) => model.id(),
+            LanguageModel::Anthropic(model) => model.id(),
             LanguageModel::ZedDotDev(model) => model.id(),
         }
     }