feat!: add function calling support to client.chat() & client.chat_async()

BREAKING CHANGE: Too many to count in this version. Check the README examples.

Cargo.toml

@@ -15,14 +15,18 @@ readme = "README.md"
 repository = "https://github.com/ivangabriele/mistralai-client-rs"
 
 [dependencies]
+async-stream = "0.3.5"
+async-trait = "0.1.77"
+env_logger = "0.11.3"
 futures = "0.3.30"
+log = "0.4.21"
 reqwest = { version = "0.11.24", features = ["json", "blocking", "stream"] }
 serde = { version = "1.0.197", features = ["derive"] }
 serde_json = "1.0.114"
 strum = "0.26.1"
-strum_macros = "0.26.1"
 thiserror = "1.0.57"
 tokio = { version = "1.36.0", features = ["full"] }
+tokio-stream = "0.1.14"
 
 [dev-dependencies]
 jrest = "0.2.3"