Updates to align OpenAI Chat Completions with current spec and include OpenAI-specific items, drop Completions API.

Signed-off-by: declark1 <[email protected]>

Author: declark1

Cargo.lock

@@ -43,7 +43,6 @@ url = "2.5.2"
 uuid = { version = "1.10.0", features = ["v4", "fast-rng"] }
 async-trait = "0.1.81"
 async-stream = "0.3.5"
-indexmap = { version = "2.5.0", features = ["serde"] }
 http-serde = "2.1.1"
 
 [build-dependencies]