feat(openai): add updated OpenAI model constants (#314)

* feat(openai): add OpenAI model constants  Add constants for OpenAI's latest models to the OpenAI provider: - O3_MINI: OpenAI's most efficient high-context model - O3_MINI_2025_01_31: Date-specific version of O3-mini - O1: OpenAI's flagship model - O1_2024_12_17: Date-specific version of O1  These models are compatible with OpenAI's API and can be used as drop-in replacements in applications using the RIG framework.

* added missing semicolons to completion model endings

rig-core/src/providers/openai.rs

@@ -316,6 +316,14 @@ impl EmbeddingModel {
 // ================================================================
 // OpenAI Completion API
 // ================================================================
+/// `o3-mini` completion model
+pub const O3_MINI: &str = "o3-mini";
+/// `o3-mini-2025-01-31` completion model
+pub const O3_MINI_2025_01_31: &str = "o3-mini-2025-01-31";
+/// 'o1' completion model
+pub const O1: &str = "o1";
+/// `o1-2024-12-17` completion model
+pub const O1_2024_12_17: &str = "o1-2024-12-17";
 /// `o1-preview` completion model
 pub const O1_PREVIEW: &str = "o1-preview";
 /// `o1-preview-2024-09-12` completion model