Update to latest Mistral AI API (v1.0.0)

- Replace closed Model enum with flexible string-based Model type
  with constructor methods for all current models (Mistral Large 3,
  Small 4, Magistral, Codestral, Devstral, Pixtral, Voxtral, etc.)
- Add new API endpoints: FIM completions, Files, Fine-tuning, Batch
  jobs, OCR, Audio transcription, Moderations/Classifications, and
  Agent completions (sync + async for all)
- Add new chat fields: frequency_penalty, presence_penalty, stop,
  n, parallel_tool_calls, reasoning_effort, min_tokens, json_schema
  response format
- Add embedding fields: output_dimension, output_dtype
- Tool parameters now accept raw JSON Schema (serde_json::Value)
  instead of limited enum types
- Add tool call IDs and Required tool choice variant
- Add DELETE HTTP method support and multipart file upload
- Bump thiserror to v2, add reqwest multipart feature
- Remove strum dependency (no longer needed)
- Update all tests and examples for new API

examples/chat_with_function_calling.rs

@@ -1,8 +1,8 @@
 use mistralai_client::v1::{
-    chat::{ChatMessage, ChatMessageRole, ChatParams},
+    chat::{ChatMessage, ChatParams},
     client::Client,
     constants::Model,
-    tool::{Function, Tool, ToolChoice, ToolFunctionParameter, ToolFunctionParameterType},
+    tool::{Function, Tool, ToolChoice},
 };
 use serde::Deserialize;
 use std::any::Any;
@@ -16,7 +16,6 @@ struct GetCityTemperatureFunction;
 #[async_trait::async_trait]
 impl Function for GetCityTemperatureFunction {
     async fn execute(&self, arguments: String) -> Box<dyn Any + Send> {
-        // Deserialize arguments, perform the logic, and return the result
         let GetCityTemperatureArguments { city } = serde_json::from_str(&arguments).unwrap();
 
         let temperature = match city.as_str() {
@@ -32,11 +31,16 @@ fn main() {
     let tools = vec![Tool::new(
         "get_city_temperature".to_string(),
         "Get the current temperature in a city.".to_string(),
-        vec![ToolFunctionParameter::new(
-            "city".to_string(),
-            "The name of the city.".to_string(),
-            ToolFunctionParameterType::String,
-        )],
+        serde_json::json!({
+            "type": "object",
+            "properties": {
+                "city": {
+                    "type": "string",
+                    "description": "The name of the city."
+                }
+            },
+            "required": ["city"]
+        }),
     )];
 
     // This example suppose you have set the `MISTRAL_API_KEY` environment variable.
@@ -46,14 +50,12 @@ fn main() {
         Box::new(GetCityTemperatureFunction),
     );
 
-    let model = Model::MistralSmallLatest;
-    let messages = vec![ChatMessage {
-        role: ChatMessageRole::User,
-        content: "What's the temperature in Paris?".to_string(),
-        tool_calls: None,
-    }];
+    let model = Model::mistral_small_latest();
+    let messages = vec![ChatMessage::new_user_message(
+        "What's the temperature in Paris?",
+    )];
     let options = ChatParams {
-        temperature: 0.0,
+        temperature: Some(0.0),
         random_seed: Some(42),
         tool_choice: Some(ToolChoice::Auto),
         tools: Some(tools),