Port code to async-openai 0.31.1

- Update async-openai from 0.30.1 to 0.31.1
- Add chat-completion feature to enable API support
- Update imports from async_openai::types:: to async_openai::types::chat::
- Adapt to new ChatCompletionTools and ChatCompletionMessageToolCalls enums
- Remove usage of deprecated ChatCompletionToolType enum
- Wrap tool calls in enum variants (Function) as required by new API

Co-authored-by: Byron <63622+Byron@users.noreply.github.com>

Author: Copilot

Cargo.lock

@@ -115,8 +115,9 @@ schemars = { version = "1.0.4", default-features = false, features = [
     "std",
     "derive",
 ] }
-async-openai = { version = "0.30.1", default-features = false, features = [
+async-openai = { version = "0.31.1", default-features = false, features = [
     "rustls",
+    "chat-completion",
 ] }
 open = "5.3.3"
 regex = { version = "1.11.3", default-features = false, features = ["std", "unicode" ] }

Cargo.toml

@@ -1,7 +1,7 @@
 use async_openai::{
     Client,
     config::OpenAIConfig,
-    types::{
+    types::chat::{
         ChatCompletionRequestSystemMessage, ChatCompletionRequestUserMessage,
         CreateChatCompletionRequestArgs, ResponseFormat, ResponseFormatJsonSchema,
     },